java：实现查询MySQL数据库中的数据，并导出excel、pdf类型文档(超详细)

查询MySQL数据库中数据，导出excel、pdf类型文档

1.数据库表格

sql 复制代码

CREATE TABLE `user` (
  `id` int NOT NULL AUTO_INCREMENT COMMENT '编号',
  `name` varchar(255) DEFAULT NULL COMMENT '姓名',
  `age` int DEFAULT NULL COMMENT '年龄',
  `addr` varchar(255) DEFAULT NULL COMMENT '住址1',
  `addr2` varchar(255) DEFAULT NULL COMMENT '住址2',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='用户表';

2.pom.xml

xml 复制代码

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>net</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>net</name>
    <description>net</description>
    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.6.13</spring-boot.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>

        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
<!--        pdf-->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itextpdf</artifactId>
            <version>5.5.13</version> <!-- 或使用最新版本 -->
        </dependency>
        <!-- pdf输出中文要用的jar -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itext-asian</artifactId>
            <version>5.2.0</version>
        </dependency>
        
        </dependencies>
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-dependencies</artifactId>
                    <version>${spring-boot.version}</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
<!--   excel表格导出-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>
        <dependency>
            <groupId>org.xmlunit</groupId>
            <artifactId>xmlunit-core</artifactId>
        </dependency>
            </dependencies>
        </dependencyManagement>

        <build>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.1</version>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                        <encoding>UTF-8</encoding>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <version>${spring-boot.version}</version>
                    <configuration>
                        <mainClass>com.example.net.NetApplication</mainClass>
                        <skip>true</skip>
                    </configuration>
                    <executions>
                        <execution>
                            <id>repackage</id>
                            <goals>
                                <goal>repackage</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
            </plugins>
        </build>
    </project>

3.User.java

java 复制代码

package com.example.net.demos.entity;

import lombok.Data;

@Data
public class User {
    private Integer id;
    private String name;
    private Integer age;
    private String addr;
    private String addr2;
}

4.UserMapper.java

java 复制代码

package com.example.net.demos.mapper;

import com.example.net.demos.entity.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapper {
    List<User> selectList();
}

5.UserMapper.xml

xml 复制代码

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.net.demos.mapper.UserMapper">
    <resultMap id="user" type="com.example.net.demos.entity.User">
        <id column="id" property="id"/>
        <result column="name" property="name"/>
        <result column="age" property="age"/>
        <result column="addr" property="addr"/>
        <result column="addr2" property="addr2"/>
    </resultMap>
    <select id="selectList" resultMap="user">
        select * from user
    </select>
</mapper>

6.service

6.1 UserService.java

java 复制代码

package com.example.net.demos.service;

import com.example.net.demos.entity.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserService {
    List<User> selectAll();
}

6.2 UserServiceImpl.java

java 复制代码

package com.example.net.demos.service.impl;

import com.example.net.demos.entity.User;
import com.example.net.demos.mapper.UserMapper;
import com.example.net.demos.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    UserMapper userMapper;

    @Override
    public List<User> selectAll() {
        return userMapper.selectList();
    }
}

7.UserController

java 复制代码

package com.example.net.demos.controller;

import com.example.net.demos.entity.User;
import com.example.net.demos.service.UserService;
import com.example.net.demos.util.PageUtil;
import com.example.net.demos.util.PdfFUtil;
import com.example.net.demos.util.R;
import com.itextpdf.text.Document;
import com.itextpdf.text.Font;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.io.File;
import java.io.FileOutputStream;
import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {
    private Logger logger= LoggerFactory.getLogger(UserController.class);
    @Autowired
    UserService userService;

    /**
     * 查询所有数据
     * @return
     */
    @PostMapping("/list")
    public R selectList(){
        List<User> users = userService.selectAll();
        logger.info(users.toString());
        return R.ok(users);
    }

 /**
     * 导出pdf格式文档
     * @param destination
     * @return
     * @throws Exception
     */
    @PostMapping("/pdf")
    public List<User> getUser(@RequestParam("destination") String destination) throws Exception {
        List<User> list=userService.selectAll();
        long currentTime=System.currentTimeMillis();
        int total=list.size();
        try {
//            1.新建document对象
            Document document = new Document(PageSize.A4.rotate());  //建立一个Document对象
//            pdf文档存储的地址
            String savePath=destination+"/"+"user_"+currentTime+".pdf";


//            2.建立一个书写器（writer）与document对象关联
            File file = new File(savePath);  //修改要生成pdf的位置路径
            file.createNewFile();
            PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(file));

//            3.打开文档
            document.open();

//            标题
            Paragraph paragraph = new Paragraph("用户表", titlefont_16);
            paragraph.setAlignment(1); //设置文字居中，0靠左，1居中，2靠右
            paragraph.setIndentationLeft(12); //设置左缩进
            paragraph.setIndentationRight(12);  //设置右缩进
            paragraph.setFirstLineIndent(24); //设置首行缩进
            paragraph.setLeading(20f);  //设置行间距
            paragraph.setSpacingBefore(5f);  //设置段落上空白
            paragraph.setSpacingAfter(10f);  //设置段落下空白

            document.add(paragraph);   //标题

            int pn = 1;
            int ps = 34;
            for (int j = 0; j < (total / ps) + 1; j++) {

                PageUtil pageUtil1 = new PageUtil();
                List<User> listPage=pageUtil1.pageUtil(list,pn,ps);
//                表格
                PdfPTable table = PdfFUtil.createTable(new float[]{75, 110, 75, 140,75});
                table.addCell(PdfFUtil.createCell("ID",textfont_10));
                table.addCell(PdfFUtil.createCell("姓名",textfont_10));
                table.addCell(PdfFUtil.createCell("年龄",textfont_10));
                table.addCell(PdfFUtil.createCell("住址",textfont_10));
                table.addCell(PdfFUtil.createCell("住址2",textfont_10));

                for (int i = 0; i < listPage.size(); i++) {
                    table.addCell(PdfFUtil.createCell(String.valueOf(listPage.get(i).getId()), textfont_10));
                    table.addCell(PdfFUtil.createCell(listPage.get(i).getName(), textfont_10));
                    table.addCell(PdfFUtil.createCell(String.valueOf(listPage.get(i).getAge()), textfont_10));
                    table.addCell(PdfFUtil.createCell(String.valueOf(listPage.get(i).getAddr()), textfont_10));
                    table.addCell(PdfFUtil.createCell(String.valueOf(listPage.get(i).getAddr2()), textfont_10));
                }
                document.add(table);
                PdfFUtil.onEndPage(writer, document);
                pn++;
                ps = 36;
            }
//            5.关闭文档
            document.close();
        }
        catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }
    /**
     * 全局变量
     */
//    定义全局的字体静态变量
    private static Font titlefont_16;
    private static Font titlefontnormal_16;
    private static Font headfont_14;
    private static Font headfontnormal_14;
    private static Font headfont_12;
    private static Font headfontnormal_12;
    private static Font keyfont_10;
    private static Font textfont_10;
    private static Font underlinefont_10;
//    静态代码块
    static{
        try{
            BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            titlefont_16=new Font(bfChinese,16,Font.BOLD);
            headfont_14=new Font(bfChinese,14,Font.BOLD);
            headfont_12=new Font(bfChinese,12,Font.BOLD);
            keyfont_10=new Font(bfChinese,10,Font.BOLD);

            titlefontnormal_16=new Font(bfChinese,16,Font.NORMAL);
            headfontnormal_14=new Font(bfChinese,14,Font.NORMAL);
            headfontnormal_12=new Font(bfChinese,12,Font.NORMAL);
            textfont_10=new Font(bfChinese,10, Font.NORMAL);
            underlinefont_10=new Font(bfChinese,10,Font.UNDERLINE);
        }
        catch (Exception e){
            e.printStackTrace();
        }
    }
    
 /**
     * 导出excel表格
     * @param response
     * @throws Exception
     */
    @PostMapping("/excel")
    public void downloadExcel(HttpServletResponse response) throws Exception {
//        创建HSSFWorkbook对象，excel的文档对象
        HSSFWorkbook workbook = new HSSFWorkbook();
//        excel的表单
        HSSFSheet sheet = workbook.createSheet("用户表");

//        数据库表中的数据
        List<User> list=userService.selectAll();

//        设置要导出的文件名
        String fileName="user"+".xls";
//        新增数据行，并且设置单元格数据
        int rowNum=1;
        String[] headers={"ID","姓名","年龄","住址","住址2"};
//        headers 标识excel表中第一行的表头
        HSSFRow row = sheet.createRow(0);
//        在excel表中添加表头
        for(int i=0;i<headers.length;i++){
            HSSFCell cell=row.createCell(i);
            HSSFRichTextString text=new HSSFRichTextString(headers[i]);
            cell.setCellValue(text);
        }
//        在表头中存放查询到的数据放入对应的列
        for(User user:list){
            HSSFRow row1=sheet.createRow(rowNum);
            row1.createCell(0).setCellValue(user.getId());
            row1.createCell(1).setCellValue(user.getName());
            row1.createCell(2).setCellValue(user.getAge());
            row1.createCell(3).setCellValue(user.getAddr());
            row1.createCell(4).setCellValue(user.getAddr2());
            rowNum++;
        }
        response.setContentType("application/octet-stream");
        response.setHeader("Content-disposition", "attachment;filename=" + fileName);
        response.flushBuffer();
        workbook.write(response.getOutputStream());
    }
}

8.工具类

8.1 PageUtil.java

java 复制代码

package com.example.net.demos.util;

import java.io.Serializable;
import java.util.List;
import java.util.stream.Collectors;

public class PageUtil<T> implements Serializable {
    /**
     * 实体类列表
     */
    private List<T> content;
    /**
     * 是否首页
     */
    private boolean first;
    /**
     * 是否尾页
     */
    private boolean last;
    /**
     * 总记录数
     */
    private Integer totalCount;
    /**
     * 总页数
     */
    private Integer totalPages;
    /**
     * 当前页记录数
     */
    private Integer count;
    /**
     * 每页记录数
     */
    private Integer pageSize;
    /**
     * 当前页
     */
    private Integer pageNum;

    @Override
    public String toString() {
        return "PageUtil{" +
                "content=" + content +
                ", first=" + first +
                ", last=" + last +
                ", totalCount=" + totalCount +
                ", totalPages=" + totalPages +
                ", count=" + count +
                ", pageSize=" + pageSize +
                ", pageNum=" + pageNum +
                '}';
    }

    public Integer getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(Integer totalCount) {
        this.totalCount = totalCount;
    }

    public Integer getCount() {
        return count;
    }

    public void setCount(Integer count) {
        this.count = count;
    }

    public void setContent(List<T> content) {
        this.content = content;
    }

    public void setFirst(boolean first) {
        this.first = first;
    }

    public void setLast(boolean last) {
        this.last = last;
    }


    public void setTotalPages(Integer totalPages) {
        this.totalPages = totalPages;
    }


    public void setPageSize(Integer pageSize) {
        this.pageSize = pageSize;
    }

    public void setPageNum(Integer pageNum) {
        this.pageNum = pageNum;
    }

    public List<T> getContent() {
        return content;
    }

    public boolean isFirst() {
        return first;
    }

    public boolean isLast() {
        return last;
    }


    public Integer getTotalPages() {
        return totalPages;
    }


    public Integer getPageSize() {
        return pageSize;
    }

    public Integer getPageNum() {
        return pageNum;
    }

    //public List<T> pageUtil(Integer page, Integer size, List<T> list) {
    public List<T> pageUtil( List<T> list,Integer page, Integer size) {
        page = page <= 0 ? 1 : page;
        List<T> list1 = list.stream().skip((page - 1) * size).limit(size).collect(Collectors.toList());
        int length = list.size();
        //是否第一页
        this.first = (page == 1);
        //是否最后一页
        this.last = (page == (length - 1) / size);
        //总页数
        this.totalPages = ((length - 1) / size + 1);
        //总elements
        this.totalCount = (length);
        //每页多少elements
        this.pageSize = (size);
        //内容
        this.content = (list1);
        //当前页数据量
        this.count = (list1.size());
        //当前页数，第一页是1
        this.pageNum = (page);
        return list1;
    }

}

8.2 PdfFUtil.java

java 复制代码

package com.example.net.demos.util;

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;

import java.io.IOException;

public class PdfFUtil {
    // 最大宽度
    private static int maxWidth = 720;

/**------------------------创建表格单元格的方法start----------------------------*/
    /**
     * 创建单元格(指定字体)
     *
     * @param value
     * @param font
     * @return
     */
    public static PdfPCell createCell(String value, Font font) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中
        cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中
        cell.setPhrase(new Phrase(value, font));
        return cell;
    }

    /**
     * 创建单元格(指定字体、设置单元格高度)
     *
     * @param value
     * @param font
     * @return 申请事由------这行使用的方法
     */
    public static PdfPCell createCell(String value, Font font, float f) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(Element.ALIGN_CENTER);
        cell.setPhrase(new Phrase(value, font));
        cell.setFixedHeight(f); // 设置表格中的单行高度
        return cell;
    }

    /**
     * 创建单元格（指定字体、水平局左/中/右）
     *
     * @param value
     * @param font
     * @param align
     * @return
     */
    public static PdfPCell createCell(String value, Font font, int align) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中
        cell.setHorizontalAlignment(align); //水平居中
        cell.setPhrase(new Phrase(value, font));
        return cell;
    }

    /**
     * 创建单元格（指定字体、水平局左/中/右、单元格跨x列合并）
     *
     * @param value
     * @param font
     * @param align
     * @param colspan
     * @return
     */
    public PdfPCell createCell(String value, Font font, int align, int colspan) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中
        cell.setHorizontalAlignment(align); //水平居中
        cell.setColspan(colspan);
        cell.setPhrase(new Phrase(value, font));
        return cell;
    }

    /**
     * 创建单元格（指定字体、水平居..、单元格跨x列合并、设置单元格内边距）
     *
     * @param value
     * @param font
     * @param align
     * @param colspan
     * @param boderFlag
     * @return
     */
    public static PdfPCell createCell(String value, Font font, int align, int colspan, boolean boderFlag) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(align);
        cell.setColspan(colspan);
        cell.setPhrase(new Phrase(value, font));
        cell.setPadding(3.0f);
        if (!boderFlag) {
            cell.setBorder(0);
            cell.setPaddingTop(10.0f);
            cell.setPaddingBottom(7.0f);
        } else if (boderFlag) {
            cell.setBorder(0);
            cell.setPaddingTop(0.0f);
            cell.setPaddingBottom(15.0f);
        }
        return cell;
    }

    /**
     * 创建单元格（指定字体、水平..、边框宽度：0表示无边框、内边距）
     *
     * @param value
     * @param font
     * @param align
     * @param borderWidth
     * @param paddingSize
     * @param flag
     * @return
     */
    public static PdfPCell createCell(String value, Font font, int align, float[] borderWidth, float[] paddingSize, boolean flag) {
        PdfPCell cell = new PdfPCell();
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(align);
        cell.setPhrase(new Phrase(value, font));
        cell.setBorderWidthLeft(borderWidth[0]);
        cell.setBorderWidthRight(borderWidth[1]);
        cell.setBorderWidthTop(borderWidth[2]);
        cell.setBorderWidthBottom(borderWidth[3]);
        cell.setPaddingTop(paddingSize[0]);
        cell.setPaddingBottom(paddingSize[1]);
        if (flag) {
            cell.setColspan(2);
        }
        return cell;
    }
/**------------------------创建表格单元格的方法end----------------------------*/


/**--------------------------创建表格的方法start----------------------------*/
    /**
     * 创建默认列宽，指定列数、水平(居中、右、左)的表格
     *
     * @param colNumber
     * @param align
     * @return
     */
    public PdfPTable createTable(int colNumber, int align) {
        PdfPTable table = new PdfPTable(colNumber);
        try {
            table.setTotalWidth(maxWidth);
            table.setLockedWidth(true);
            table.setHorizontalAlignment(align);
            table.getDefaultCell().setBorder(1);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return table;
    }

    /**
     * 创建指定列宽、列数的表格
     *
     * @param widths
     * @return
     */
    public static PdfPTable createTable(float[] widths) {
        PdfPTable table = new PdfPTable(widths);
        try {
            table.setTotalWidth(maxWidth);
            table.setLockedWidth(true);
            table.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.getDefaultCell().setBorder(1);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return table;
    }

    /**
     * 创建空白的表格
     *
     * @return
     */
    public PdfPTable createBlankTable() throws IOException, DocumentException {
        BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
        Font keyfont = new Font(bfChinese, 10, Font.BOLD);
        PdfPTable table = new PdfPTable(1);
        table.getDefaultCell().setBorder(0);
        table.addCell(createCell("", keyfont));
        table.setSpacingAfter(20.0f);
        table.setSpacingBefore(20.0f);
        return table;
    }
/**--------------------------创建表格的方法end----------------------------*/
    /**
     * --------------------------页码方法start----------------------------
     */
    public static void onEndPage(PdfWriter writer, Document document) throws IOException, DocumentException {
        PdfContentByte cb = writer.getDirectContent();
        PdfTemplate tpl; // 页码模板用来固定显示数据
        BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
        tpl = writer.getDirectContent().createTemplate(100, 100);
        cb.saveState();
        String text = "第" + writer.getPageNumber() + "页";
        cb.beginText();
        cb.setFontAndSize(bfChinese, 8);
        cb.setTextMatrix(480, 35);//定位"第x页" 在具体的页面调试时候需要更改这xy的坐标
        cb.showText(text);
        cb.endText();
        //** 创建以及固定显示总页数的位置
        cb.addTemplate(tpl, 283, 10);//定位"y页" 在具体的页面调试时候需要更改这xy的坐标
        cb.stroke();
        cb.restoreState();
        cb.closePath();
/**--------------------------页码方法end----------------------------*/
    }
}

8.3 R.java

java 复制代码

package com.example.net.demos.util;

import java.io.Serializable;

public class R<T> implements Serializable {
    /**
     * 成功
     */
    public static final int SUCCESS = 200;
    /**
     * 失败
     */
    public static final int FAIL = 500;
    private static final long serialVersionUID = 1L;
    private int code;

    private String msg;

    private T data;

    public static <T> R<T> ok() {
        return restResult(null, SUCCESS, "操作成功");
    }

    public static <T> R<T> ok(T data) {
        return restResult(data, SUCCESS, "操作成功");
    }

    public static <T> R<T> ok(T data, String msg) {
        return restResult(data, SUCCESS, msg);
    }

    public static <T> R<T> fail() {
        return restResult(null, FAIL, "操作失败");
    }

    public static <T> R<T> fail(String msg) {
        return restResult(null, FAIL, msg);
    }

    public static <T> R<T> fail(T data) {
        return restResult(data, FAIL, "操作失败");
    }

    public static <T> R<T> fail(T data, String msg) {
        return restResult(data, FAIL, msg);
    }

    public static <T> R<T> fail(int code, String msg) {
        return restResult(null, code, msg);
    }

    private static <T> R<T> restResult(T data, int code, String msg) {
        R<T> apiResult = new R<>();
        apiResult.setCode(code);
        apiResult.setData(data);
        apiResult.setMsg(msg);
        return apiResult;
    }

    public static <T> Boolean isError(R<T> ret) {
        return !isSuccess(ret);
    }

    public static <T> Boolean isSuccess(R<T> ret) {
        return R.SUCCESS == ret.getCode();
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}