java 解析 xml 字符串转换为实体，实体转换为 xml 字符串

java 解析 xml 字符串转换为实体，实体转换为 xml 字符串

1. XmlCommonUtil工具类代码如下：

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import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

/**
 * XmlCommonUtil类用于XML字符串和对象之间的转换以及读取文件操作
 */
public class XmlCommonUtil {

    /**
     * 将XML字符串转换为指定类的对象
     *
     * @param xml   XML字符串
     * @param clazz 目标类的Class对象
     * @return 转换后的对象
     */
    public static Object convertXmlStrToObject(String xml, Class clazz) throws Exception {
        JAXBContext context = JAXBContext.newInstance(clazz);
        Unmarshaller unmarshaller = context.createUnmarshaller();
        StringReader reader = new StringReader(xml);
        return unmarshaller.unmarshal(reader);
    }

    /**
     * 将实体对象转换为XML字符串
     *
     * @param obj 实体对象
     * @return 转换后的字符串
     */
    public static String convertObjectToXml(Object obj) throws Exception {
        StringWriter sw = new StringWriter();
        JAXBContext context = JAXBContext.newInstance(obj.getClass());
        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        marshaller.marshal(obj, sw);
        return sw.toString();
    }
}

2. 模拟资源文件数据SqlList.xml：

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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<sqls>
    <sql>
        SELECT 1
        WHERE 1 = 1
    </sql>
    <sql>
        SELECT 2
        WHERE 2 = 2
    </sql>
</sqls>

3. 实体类SqlXml代码如下：

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import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
/**
 * SqlXml类用于表示XML中的sql元素
 */
@XmlRootElement(name = "sqls")
@XmlType(propOrder = {"sql"})
public class SqlXml {
    private List<String> sql;

    @XmlElement(name = "sql")
    public List<String> getSql() {
        return sql;
    }

    public void setSql(List<String> sql) {
        this.sql = sql;
    }

    @Override
    public String toString() {
        return "SqlXml{" +
                "sql=" + sql +
                '}';
    }
}

4. main方法代码测试：

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    public static void main(String[] args) throws Exception{
        // 读取指定文件中的XML内容
        String xmlStr = readFile("sql/SqlList.xml");

        // 将XML字符串转换为SqlXml对象
        SqlXml sqlXml = (SqlXml)convertXmlStrToObject(xmlStr, SqlXml.class);
        System.out.println(sqlXml);

        // 将SqlXml对象转换为XML字符串
        xmlStr = convertObjectToXml(sqlXml);
        System.out.println(xmlStr);
    }

    /**
     * 读取指定文件并返回文件内容
     *
     * @param file 文件路径
     * @return 文件内容字符串
     */
    public static String readFile(String file) {
        StringBuffer sb = null;
        try {
            InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(file);
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            sb = new StringBuffer();
            String line = "";
            while ((line = bufferedReader.readLine()) != null) {
                sb.append(line + "\r\n");
            }
            bufferedReader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

5. 执行结果：

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SqlXml{sql=[
        SELECT 1
        WHERE 1 = 1
    , 
        SELECT 2
        WHERE 2 = 2
    ]}
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<sqls>
    <sql>
        SELECT 1
        WHERE 1 = 1
    </sql>
    <sql>
        SELECT 2
        WHERE 2 = 2
    </sql>
</sqls>


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