一个 springBoot 项目中使用 xstream 将 xml 转换成 bean 报错，所以写一个 xml 转成 map 的方法

        <dependency>
            <groupId>org.dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>2.1.0</version>
        </dependency>

调用： Map<String, Object> map = parserXmlString( xmlMsg );

    /**
     * 将 xml 字符串 转换为 map
        <ResponseInfo>   --- xml 字符串
           <ResCode>Failed</ResCode>
           <ResMessage>Already in use</ResMessage>
           <ErrorNo>3</ErrorNo>
        </ResponseInfo>
     */
    public static Map<String, Object> parserXmlString( String xml ) {
        // xml 字符串中可能包含的 key
        List<String> keys = new ArrayList<>();
        keys.add( "ResCode" );
        keys.add( "ResMessage" );
        keys.add( "ErrorNo" );

        Map<String, Object> map = new HashMap<>();

        SAXReader saxReader = new SAXReader();

        try {
            Document document = saxReader.read( 
                                new ByteArrayInputStream( xml.getBytes() ) );
            Element responseInfo = document.getRootElement();

            for ( int i = 0; i < keys.size(); i++ ) {
                String key = keys.get( i );

                if ( responseInfo.elements( key ).isEmpty() == false ) {
                    Element Command = ( Element ) responseInfo.elements( key ).get( 0 );
                    Object value = Command.getData();

                    map.put( key, value );
                } else {
                    map.put( key, "" );
                }
            }
        } catch ( DocumentException e ) {
            System.out.println( e.getMessage() );
        }

        return map;
    }