在做接口解析时候出现的错误：Invalid byte 2 of 2-byte UTF-8 sequence. Nested exception: Invalid byte 2 of 2-byte UTF-8 sequence.

很明显是在读取XML文件时候出现的编码问题！
在测试过程中发现，主要原因是xml文件中声明的编码与xml文件本身保存时的编码不一致。

现在解决的办法就有几个，主要说我测试过的两个方。
如果你是直接以文件的形式读取 可以更改XML文件中的 UTF-8编码 改为 GBK或GB2312 .
还有一种可能是 你直接以URL 通过网络地址获取InputStream流形式读取 在转换成Document对象。这种方法的解决办法是先down 下来保存在本地。实现比较简单 用个OutputStream流写到你想保存的目录即可。再解析down下来的文件 其中在 SAXReader saxReader = new SAXReader();

正常写法：

private ImpowerDeviceVo getResponseXml(String requestUrl,String requestXml) throws Exception
{
if (StringUtils.isEmpty(requestUrl))
{
String message = "config-WebPortal.xml配置文件未配置,获取接口连接为空!";
logger.debug(message);
logger.error(message);
}

URL httpurl = new URL(requestUrl);
HttpURLConnection httpConn = (HttpURLConnection) httpurl.openConnection();
httpConn.setConnectTimeout(ImpowerXmlNodeName.connectTimeout);
httpConn.setReadTimeout(ImpowerXmlNodeName.readTimeout);
httpConn.setRequestMethod(ImpowerXmlNodeName.requestMethod);
httpConn.setDoInput(true);
// 将doOutput标志设置为true，指示应用程序要将数据写入URL连接。
httpConn.setDoOutput(true);
OutputStream out = httpConn.getOutputStream();
logger.debug("requestXml:" + requestXml);
// 将参数写入URL接口连接
out.write(requestXml.getBytes("utf-8"));

SAXBuilder sax = new SAXBuilder();
Document doc = sax.build(httpConn.getInputStream());

// 获取到信息
ImpowerDeviceVo impowerDeviceVo = this.getImpowerDeviceVoByDocument(doc);

httpConn.disconnect();
out.close();

return impowerDeviceVo;
}

修改方法如下：

造一个临时文件保存所定的编码报文，然后读取，读取解析后关闭流，再删除文件，否则会报文件读取多误 read error

private ImpowerDeviceVo getResponseXml(String requestUrl,获取接口连接为空!";
logger.debug(message);
logger.error(message);
}

URL httpurl = new URL(requestUrl);
HttpURLConnection httpConn = (HttpURLConnection) httpurl.openConnection();
httpConn.setConnectTimeout(ImpowerXmlNodeName.connectTimeout);
httpConn.setReadTimeout(ImpowerXmlNodeName.readTimeout);
httpConn.setRequestMethod(ImpowerXmlNodeName.requestMethod);
httpConn.setDoInput(true);
// 将doOutput标志设置为true，指示应用程序要将数据写入URL连接。
httpConn.setDoOutput(true);
OutputStream out = httpConn.getOutputStream();
logger.debug("requestXml:" + requestXml);
// 将参数写入URL接口连接
out.write(requestXml.getBytes("utf-8"));

InputStream inputStream = httpConn.getInputStream();
String fileName = "tempxml.xml";

// 保存文件
File f = new File(fileName);
if (!f.exists())
{
f.createNewFile();
}
String xmlContent = readXmlStream(inputStream);
System.out.println("进入-----------"+xmlContent);
FileOutputStream fileOutputStream = new FileOutputStream(f);
fileOutputStream.write(xmlContent.getBytes("utf-8"));
fileOutputStream.close();
// 打开文件
f = new File(fileName);
FileInputStream fileInputStream = new FileInputStream(f);

SAXBuilder sax = new SAXBuilder();
// Document doc = sax.build(httpConn.getInputStream());
Document doc = sax.build(fileInputStream);

// 获取到信息
ImpowerDeviceVo impowerDeviceVo = this.getImpowerDeviceVoByDocument(doc);

httpConn.disconnect();
out.close();
fileInputStream.close();
f.delete();

return impowerDeviceVo; }