java socket调用webservice以及如何解决连接重置报错问题

一、写这篇记录的原因：最近看了一些关于关于socket模拟文件服务器的文章或者视频，客户端通过浏览器访问，服务端通过socket去实现，学习之下了解到就是向socket发送制定格式的内容【http协议】，然后服务端进行解析，返回相关的数据，于是就想肯定要可以使用socket模拟调用webservice【webservice就是http协议+soap报文通过tcp协议来传输】，当然了使用httpclient去模拟发送get/post请求最方便，不过也是自己对http协议深入理解【原来的理解就知道http协议是什么样的，但是具体发送的啥内容也模糊】二、直接贴代码：1.调用部分package com.pjf.netbase;import com.pjf.netentity.Response; import com.pjf.netservice.ClientService;public class WebServiceClient { public final static int BYTELEN = 1024;// 经测试64个字节以上没有问题 public static void main(String[] args) throws Exception { long startTime = System.currentTimeMillis(); String req = /* * "<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n" + */ "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\r\n" + "<soap:Body>\r\n" + "<getSupportCity xmlns=\"http://WebXml.com.cn/\">\r\n" + "<byProvinceName>安徽</byProvinceName>\r\n" + "</getSupportCity>\r\n" + "</soap:Body>\r\n" + "</soap:Envelope>\r\n"; String head = "POST /WebServices/WeatherWebService.asmx HTTP/1.1\r\n" + "Host: www.webxml.com.cn\r\n" +"Content-Type: text/xml; charset=utf-8\r\n" + "Content-Length:" + req.getBytes().length + "\r\n" +"SOAPAction: \"http://WebXml.com.cn/getSupportCity\"\r\n\r\n"; Response res=ClientService.callWebService(head, req, "www.webxml.com.cn", 80); if(res.getStatus().equals("999")){ System.out.println("连接异常，请检查连接"); }else{ System.out.println(res.toString()); } }}2.Response对象定义package com.pjf.netentity;import java.util.HashMap; import java.util.Iterator; import java.util.Map;/** * * @author pengjf 作为调用webservice的返回对象封装 * */ public class Response { private String status;// 状态 private String statusNum; private String version; public Response() { status = "-999"; } public String getStatusNum() { return statusNum; } public void setStatusNum(String statusNum) { this.statusNum = statusNum; } public String getVersion() { return version; } public void setVersion(String version) { this.version = version; } private Map<String, String> headMap = new HashMap<String, String>();// 头节点 private String resultSoapXml = "";// 解析内容 public String getStatus() { return status; } public void setStatus(String status) { this.status = status; } public Map<String, String> getHeadMap() { return headMap; } public void setHeadMap(Map<String, String> headMap) { this.headMap= headMap; } public String getResultSoapXml() { return resultSoapXml; } public void setResultSoapXml(String resultSoapXml) { this.resultSoapXml = resultSoapXml; } @Override public String toString() { String result = ""; Iterator iter = headMap.entrySet().iterator(); while (iter.hasNext()) { Map.Entry entry = (Map.Entry) iter.next(); result += entry.getKey() + "-->" + entry.getValue() + "\r\n"; } return status + " " + statusNum + " " + version + "\r\n" + result + "\r\n" + resultSoapXml; } }3.socket调用webservice以及返回数据的处理【整个调用以及处理的核心】package com.pjf.netservice;import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.net.Socket; import java.net.UnknownHostException;import com.pjf.netentity.Response;public class ClientService { public static int BYTELEN = 1024; public static Response callWebService(String head,String request,String host,int port) throws UnknownHostException, IOException{ Socket socket = new Socket(host, port); PrintWriter pw = new PrintWriter(socket.getOutputStream()); pw.println(head + request); pw.flush(); Response res=praseInputStrem(socket); pw.close(); pw=null; return res; } public static Response praseInputStrem(Socket socket) { Response res = new Response(); try { long startTime = System.currentTimeMillis(); // 接受客户端的响应 byte[] b = new byte[BYTELEN]; byte[] context = null; byte[] headbyte = null; InputStream is = socket.getInputStream(); int len = 0; int start_position = 0; int end_position = 0; int contlen = 0; boolean isContinue = true; boolean isFirstLine=true; while ((len = is.read(b)) != -1) { System.out.println("每次读取的长度：" + len); // 解析内容 if (isContinue) { // 针对头部信息，防止制定的字节一个byte[len]你不够，此处进行字节数组拼接 if (headbyte == null) { headbyte = new byte[len]; System.arraycopy(b, 0, headbyte, 0, len); } else { byte[] tmp = new byte[headbyte.length + len]; System.arraycopy(headbyte, 0, tmp, 0, headbyte.length); System.arraycopy(b, 0, tmp, headbyte.length, len); headbyte = tmp; b = tmp; } for (int i = start_position; i < b.length; i++) { if (b[i] == '\r') { end_position = i; String data = new String(b, start_position, end_position - start_position); if (isFirstLine) { isFirstLine=false; System.out.println(data); String[] firstLineData = data.trim().split(" "); if (firstLineData.length != 3) { res.setStatus("999"); return res; } else { res.setStatus(firstLineData[2]); res.setStatusNum(firstLineData[1]); res.setVersion(firstLineData[0]); } } // String data = new String(b, start_position, // end_position - start_position); if (data.contains("Content-Length")) { // System.out.println("----contlen"+data); contlen = Integer.parseInt(data.split(" ")[1]); } if(data.contains(":")){ String[] headsplit = data.split(":"); res.getHeadMap().put(headsplit[0].trim(),headsplit[1].trim()); } System.out.println("每次读取输出的内容：" + data); start_position = i + 2; i = i + 1; if (data.equals("")) { isContinue = false; System.out.println("内容准备读取,跳出循环准备全部去读"); break; } } } } // 如果头结点已经读取完毕，则进行保留内存的内容结点 if (isContinue == false) { if (context == null) { context = new byte[b.length - start_position]; if (b.length - start_position > 0) { System.arraycopy(b, start_position, context, 0, b.length - start_position); } // 需要判断是否立即结束 ----针对于一次读完的情况,加入此判断，否则可能存在问题 if (len < BYTELEN) { break; } } else { byte[] tmp = new byte[context.length + len]; System.arraycopy(context, 0, tmp, 0, context.length); System.arraycopy(b, 0, tmp, context.length, len); context = tmp; System.out.println((context.length) + "-------------" + contlen); if (context.length == contlen) {// 表示数据读取完毕 break; } } } } long endTime = System.currentTimeMillis(); System.out.println("使用时间：" + (endTime - startTime)); res.setResultSoapXml(new String(context)); socket.shutdownInput(); socket.shutdownOutput(); is.close(); is = null; socket = null; System.out.println("处理完毕"); } catch (IOException e) { System.out.println(e); } return res; }}三、测试结果：OK 200 HTTP/1.1Server-->Microsoft-IIS/6.0Cache-Control-->private, max-age=0X-AspNet-Version-->2.0.50727Content-Length-->838Date-->Tue, 12 Dec 2017 15X-Powered-By-->ASP.NETContent-Type-->text/xml; charset=utf-8<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><getSupportCityResponse xmlns="http://WebXml.com.cn/"><getSupportCityResult><string>合肥 (58321)</string><string>巢湖 (58326)</string><string>蚌埠 (58221)</string><string>安庆 (58424)</string><string>六安 (58311)</string><string>滁州 (58236)</string><string>马鞍山 (58336)</string><string>阜阳 (58203)</string><string>宣城 (58433)</string><string>铜陵 (58429)</string><string>淮北 (58116)</string><string>芜湖 (58334)</string><string>宿州 (58122)</string><string>淮南 (58224)</string><string>池州 (58427)</string></getSupportCityResult></getSupportCityResponse></soap:Body></soap:Envelope>四、遇见问题错误内容很明细，就是只能打印出消息头，消息体不能打印，然后过段时间连接重置，报错，当时还怀疑服务器没有返回，使用抓包工具后，发现数据是返回的，然后这个问题就困惑了好几天关键问题：read（）会返回-1呢？答案是：当TCP通信连接的一方关闭了套接字时。【readLine底层应该也是这个类似方法】 再次分析改过后的代码，客户端用到了read（）返回-1这个条件，而服务端也用到了，只有二者有一方关闭了Socket，另一方的read（）方法才会返回-1，而在客户端打印输出前，二者都没有关闭Socket，因此，二者的read（）方法都不会返回-1，程序便阻塞在此处，都不往下执行，这便造成了死锁。基本上确定了：webservice服务端并没有关闭输出的socket输入流，由于我们只是客户端，我们就无法控制了，处理的方式就是：将inputStream流中读取完后【context-length:然后读取这个长度】，之后直接跳出再次读环节就可以了，具体就见代码了，有点小麻烦！！五、此只是本人深入一点学习http协议吧，如果要模拟http请求建议httpclient,代码有问题，也欢迎大家指正！谢谢！！！