发送 POST 请求出现异常！java.io.IOException: Server returned HTTP response code: 400 for URL:

http发送post请求报400，405，记录下原因：

报错如下：

发送 POST 请求出现异常！java.io.IOException: Server returned HTTP response code: 400 for URL: http://111.231.133.247:8083/jobScheduler/pendingJobjava.io.IOException: Server returned HTTP response code: 400 for URL: http://111.231.133.247:8083/jobScheduler/pendingJobat sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1627)at com.ulearning.ulms.util.HttpClientUtil.sendPost(HttpClientUtil.java:233)at com.ulearning.ulms.homework.action.TutorHomeworkAction.pushMessage(TutorHomeworkAction.java:799)at com.ulearning.ulms.homework.action.TutorHomeworkAction.saveOrUpdateHomework(TutorHomeworkAction.java:742)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:606)at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:280)at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:216)at com.ulearning.ulms.homework.action.TutorHomeworkAction.execute(TutorHomeworkAction.java:142)at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1480)at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:524)at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at com.ulearning.ulms.core.filter.JSPSupportFilter.doFilter(JSPSupportFilter.java:51)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at com.ulearning.ulms.util.RolePermissionFilter.doFilter(RolePermissionFilter.java:72)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at com.ulearning.ulms.util.XssFilter.doFilter(XssFilter.java:23)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at com.ulearning.ulms.util.BehaviorRecordsFilter.doFilter(BehaviorRecordsFilter.java:84)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at com.ulearning.ulms.util.i18n.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:103)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:745)

解决方法：

400报错，可以确定的是传入参数有问题，所以要从传参这查起，

错误一：

所需要的时间格式是"yyyy-MM-dd HH:mm:ss"，由于有两个时间转换的方法，而我转成了"yyyy-MM-dd HH:mm"，导致时间格式和接收方不一样，所以报了以下错误，把转换的时间格式改为和需要接受的参数一致即可

    com.alibaba.fastjson.JSONObject jsonStr = new com.alibaba.fastjson.JSONObject();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");JSONObject jsonStr = new JSONObject();Date dBefore = new Date();Calendar calendar = Calendar.getInstance(); //得到日历calendar.setTime(ah.getEndTime());//把当前时间赋给日历calendar.add(Calendar.DAY_OF_MONTH, -1);  //设置为前一天dBefore = calendar.getTime();   //得到前一天的时间String defaultStartDate = sdf.format(dBefore);    //格式化前一天jsonStr.put("pushTime", defaultStartDate );jsonStr.put("content", "你好");try {HttpClientUtil.sendPost(url, jsonStr.toString(), null,HttpClientUtil.CONTENTTYPE);} catch (Exception e) {e.printStackTrace();}

错误二：

中文参数乱码问题，导致400错误

解决方法：

发送post方法：

 public static String sendPost(String url, String param, String contentType) {OutputStreamWriter out = null;BufferedReader in = null;String result = "";try {URL realUrl = new URL(url);// 打开和URL之间的连接HttpURLConnection  conn = (HttpURLConnection) realUrl.openConnection();// 设置通用的请求属性conn.setRequestProperty("accept", "*/*");conn.setRequestProperty("connection", "Keep-Alive");conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");conn.setRequestProperty("Content-Type", contentType);// 发送POST请求必须设置如下两行conn.setDoOutput(true);conn.setDoInput(true);// 获取URLConnection对象对应的输出流// out = new PrintWriter(conn.getOutputStream());out = new OutputStreamWriter(conn.getOutputStream(), "utf-8"); // 8859_1out.write(param); // post的关键所在// 发送请求参数// out.print(param);// flush输出流的缓冲out.flush();// 定义BufferedReader输入流来读取URL的响应int code = conn.getResponseCode();if(code == 200) {in = new BufferedReader(new InputStreamReader(conn.getInputStream()));}else{in = new BufferedReader(new InputStreamReader(conn.getErrorStream()));}String line;while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {System.out.println("发送 POST 请求出现异常！" + e);e.printStackTrace();}// 使用finally块来关闭输出流、输入流finally {try {if (out != null) {out.close();}if (in != null) {in.close();}} catch (IOException ex) {ex.printStackTrace();}}return result;}

问题三：报405的原因：

在post方法中添加：

conn.setRequestProperty("Content-Type", contentType);

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发送 POST 请求出现异常！java.io.IOException: Server returned HTTP response code: 400 for URL:

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