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使用net.sf.json包将xml字符串转为JSONObject：

引入maven依赖：

		<dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.4</version>
            <classifier>jdk15</classifier>
        </dependency>
        <dependency> 
            <groupId>xom</groupId>
            <artifactId>xom</artifactId>
            <version>1.2.5</version>
        </dependency>

Java代码：

	public static void main(String[] args) throws Exception {
			String xmlString = "<informations>\n" +
                    "<returnCode>PARAMETER_ERROR</returnCode>\n" +
                    "<returnMessage>支付的唯一识别号必填！</returnMessage>\n" +
                    "</informations>";
            XMLSerializer xmlSerializer = new XMLSerializer();
            String resutStr = xmlSerializer.read(xmlString).toString();
            JSONObject jsonObject = JSONObject.fromObject(resutStr);
     }