Server returned HTTP response code: 500 for URL: http.......错误

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本文详细介绍了在调用第三方接口时遇到的中文参数导致的HTTP响应码500问题，通过代码修改成功解决了乱码问题，并分析了原因。

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在前不久做一个项目需要调用第三方接口，但一直报Server returned HTTP response code: 500 for URL: http.......错误，经过调试接口可正常调用并返回结果，如下是我改之前与之后的代码：

之前：

URL wsUrl2 = new URL(wsUrl);
				HttpURLConnection conn = (HttpURLConnection) wsUrl2.openConnection();
				conn.setDoInput(true);
				conn.setDoOutput(true);
				conn.setRequestMethod("POST");
				conn.setConnectTimeout(5*1000);
				conn.setRequestProperty("Content-Type", "text/xml;charset=UTF-8");
				conn.setRequestProperty("SOAPAction",wsUrl);
				
				OutputStream os = conn.getOutputStream();
				<span style="color:#FF0000;"><span style="background-color: rgb(204, 204, 204);">os.write(xml.getBytes());</span></span>
				System.out.println("conn.getInputStream()===="+conn);
				InputStream is = conn.getInputStream();
				byte[] b = new byte[1024];
				int len = 0;
				String s = "";
				while((len = is.read(b)) != -1){
					String ss = new String(b,0,len,"UTF-8");
					s += ss;
				}
				is.close();
				os.close();
				conn.disconnect();

修改之后：

URL wsUrl2 = new URL(wsUrl);
				HttpURLConnection conn = (HttpURLConnection) wsUrl2.openConnection();
				conn.setDoInput(true);
				conn.setDoOutput(true);
				conn.setRequestMethod("POST");
				conn.setConnectTimeout(5*1000);
				conn.setRequestProperty("Content-Type", "text/xml;charset=UTF-8");
				conn.setRequestProperty("SOAPAction",wsUrl);
				
				OutputStream os = conn.getOutputStream();
				<span style="color:#FF0000;"><span style="color:#FF0000;">os.write(xml.getBytes("UTF-8"));</span></span>
				System.out.println("conn.getInputStream()===="+conn);
				InputStream is = conn.getInputStream();
				byte[] b = new byte[1024];
				int len = 0;
				String s = "";
				while((len = is.read(b)) != -1){
					String ss = new String(b,0,len,"UTF-8");
					s += ss;
				}
				is.close();
				os.close();
				conn.disconnect();

<span style="color:#FF0000;"><span style="color:#FF0000;">os.write(xml.getBytes("UTF-8"));</span></span> 为我更改的内容。

原因分析：因为我调用接口时所传输的参数有中文，所以在调用的过程中内容变为乱码，不能返回数据。更改后乱码问题即可解决。