Servlet+Tomcat搭建Http服务

1、下载Tomcat

Tomcat官网下载：http://tomcat.apache.org/
要确保Tomcat与JDK版本对应，此文中采用的是Tomcatv8.0和JDK1.7
查看各版本对应：http://tomcat.apache.org/whichversion.html

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2、建web项目

打开eclipse
File -> New -> Dynamic Web Project
-> 输入Project name: MyServlet -> New Runtime… -> Apache Tomcat v8.0
-> Next->Browse -> 选择Tomcat v8.0安装目录 -> 确定 -> Finish
-> Next -> Next -> Generate web.xml…前打钩 -> Finish

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3、建Servlet.java

src下新建package: servletTest
servletTest下新建: ServletServer.java

项目文件如下：

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4.ServletServer.java

package servletTest;      import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;      import java.io.BufferedReader; import java.io.IOException; import java.io.PrintWriter; import java.net.URLDecoder;      public class ServletServer extends HttpServlet {          private static final long serialVersionUID = -8007568372864896315L;          protected void doPost(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {         request.setCharacterEncoding("UTF-8");         response.setContentType("text/html;charset=utf-8");         PrintWriter out = response.getWriter();                  BufferedReader bufferReader = request.getReader();         StringBuffer buffer = new StringBuffer();         String line = "";         while ((line = bufferReader.readLine()) != null) {             buffer.append(line);         }         String postData = buffer.toString();         postData = URLDecoder.decode(postData, "utf-8");         String[] params = postData.split("&");                  String id = null;         String name = null;                  for (int index = 0; index < params.length; index = index + 1) {             if (params[index].startsWith("id=")) {                 id = params[index].substring(params[index].indexOf("id=") + "id=".length());             }             if (params[index].startsWith("name=")) {                 name = params[index].substring(params[index].indexOf("name=") + "name=".length());             }         }                  if (!((null == id || id.isEmpty()) && (null == name || name.isEmpty()))) {             String ret = "id为" + id + ";name为" + name;             out.print(ret);             out.flush();             out.close();         } else {             out.print("无数据");             out.flush();             out.close();         }     }          protected void doGet(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {         doPost(request, response);     }      }

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5、web.xml配置

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6、运行SercletServer.java

Eclipse会自动弹出一个浏览器，效果如图：

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7、HttpRequest

从网上随便找一个HttpRequest来测试一下

package httpTest;      import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.io.UnsupportedEncodingException; import java.net.URL; import java.net.URLConnection; import java.net.URLEncoder;      public class HttpRequest {          public static void main(String[] args) throws UnsupportedEncodingException {         String data="id=521&name=宋";         data=URLEncoder.encode(data, "utf-8");         String sr = HttpRequest.sendPost("http://localhost:8080/MyServlet/", data);         System.out.println(sr);     }         /**     * 向指定 URL 发送POST方法的请求     *      * @param url     *            发送请求的 URL     * @param param     *            请求参数，请求参数应该是name1=value1&name2=value2 的形式。     * @return 所代表远程资源的响应结果     */    public static String sendPost(String url, String param) {        PrintWriter out = null;        BufferedReader in = null;        String result = "";        try {            URL realUrl = new URL(url);            // 打开和URL之间的连接            URLConnection conn = 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 NT5.1;SV1)");            // 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());            // 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            in = new BufferedReader(                    new InputStreamReader(conn.getInputStream()));            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;    }         }

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8、http测试结果

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9、war包

右键项目 -> Export -> WAR file
把导出的war包放在Tomcat安装目录下的webapps文件夹下
进入Tomcat安装目录下的bin文件夹，双击startup.bat运行
运行刚才的HttpRequest.java，可以得到相同的结果

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10、Tomcat？汤姆猫？喵~