项目结构;
代码如下:
BookController
package com.mstf.controller; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.codehaus.jackson.map.ObjectMapper; import com.mstf.domain.Book; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RequestMapping; @Controller @RequestMapping("/json") public class BookController { private static final Log logger = LogFactory.getLog(BookController.class); // @RequestMapping 根据 json 数据,转换成对应的 Object @RequestMapping(value="/testRequestBody") public void setJson(@RequestBody Book book,HttpServletResponse response) throws Exception { // ObjectMapper 类是 Jackson 库的主要类。他提供一些功能将 Java 对象转换成对应的 JSON ObjectMapper mapper = new ObjectMapper(); // 将 Book 对象转换成 json 输出 logger.info(mapper.writeValueAsString(book)); book.setAuthor("汪政"); response.setContentType("text/html;charset=UTF-8"); // 将 Book 对象转换成 json 写到客户端 response.getWriter().println(mapper.writeValueAsString(book)); } }
UserController
package com.mstf.controller; import java.util.ArrayList; import java.util.List; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.mstf.domain.User; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; // Controller 注解用于指示该类是一个控制器,可以同时处理多个请求动作 @Controller // RequestMapping 可以用来注释一个控制器类,此时,所有方法都将映射为相对于类级别的请求, // 表示该控制器处理所有的请求都被映射到 value属性所指示的路径下 @RequestMapping(value="/user") public class UserController { // 静态 List<User> 集合,此处代替数据库用来保存注册的用户信息 private static List<User> userList; // UserController 类的构造器,初始化 List<User> 集合 public UserController() { super(); userList = new ArrayList<User>(); } // 静态的日志类 LogFactory private static final Log logger = LogFactory.getLog(UserController.class); // 该方法映射的请求为 http://localhost:8080/context/user/register ,该方法支持GET请求 @RequestMapping(value="/register",method=RequestMethod.GET) public String registerForm() { logger.info("register GET方法被调用..."); // 跳转到注册页面 return "register"; } // 该方法映射的请求支持 POST 请求 @RequestMapping(value="/register",method=RequestMethod.POST) // 将请求中的 loginname 参数的值赋给 loginname 变量, password 和 username 同样处理 public String register( @RequestParam("loginName") String loginName, @RequestParam("passWord") String passWord, @RequestParam("userName") String userName) { logger.info("register POST方法被调用..."); // 创建 User 对象 User user = new User(); user.setLoginName(loginName); user.setPassWord(passWord); user.setUserName(userName); // 模拟数据库存储 User 信息 userList.add(user); // 跳转到登录页面 return "login"; } // 该方法映射的请求为 http://localhost:8080/RequestMappingTest/user/login @RequestMapping("/login") public String login( // 将请求中的 loginName 参数的值赋给 loginName 变量, passWord 同样处理 @RequestParam("loginName") String loginName, @RequestParam("passWord") String passWord, Model model) { logger.info("登录名:"+loginName + " 密码:" + passWord); // 到集合中查找用户是否存在,此处用来模拟数据库验证 for(User user : userList){ if(user.getLoginName().equals(loginName) && user.getPassWord().equals(passWord)){ model.addAttribute("user",user); return "welcome"; } } return "login"; } }
Book
package com.mstf.domain; import java.io.Serializable; public class Book implements Serializable { private static final long serialVersionUID = 1L; private int id; private String name; private String author; public Book() { } public Book(int id, String name, String author) { super(); this.id = id; this.name = name; this.author = author; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAuthor() { return author; } public void setAuthor(String author) { this.author = author; } @Override public String toString() { return "Book [id=" + id + ", name=" + name + ", author=" + author + "]"; } }
User
package com.mstf.domain; import java.io.Serializable; // 域对象,实现序列化接口 public class User implements Serializable { // 序列化 private static final long serialVersionUID = 1L; // 私有字段 private String loginName; private String userName; private String passWord; // 公共构造器 public User() { super(); } // get/set 方法 public String getLoginName() { return loginName; } public void setLoginName(String loginName) { this.loginName = loginName; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPassWord() { return passWord; } public void setPassWord(String passWord) { this.passWord = passWord; } }
springmvc-config.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd"> <!-- spring可以自动去扫描base-pack下面的包或者子包下面的java文件, 如果扫描到有Spring的相关注解的类,则把这些类注册为Spring的bean --> <context:component-scan base-package="com.mstf.controller"/> <!-- 设置配置方案 --> <mvc:annotation-driven/> <!-- 使用默认的 servlet 来响应静态文件 --> <mvc:default-servlet-handler/> <!-- 视图解析器 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 前缀 --> <property name="prefix"> <value>/WEB-INF/jsp/</value> </property> <!-- 后缀 --> <property name="suffix"> <value>.jsp</value> </property> </bean> </beans>
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>登录</title> </head> <body> <h4>登录</h4> <br> <form action="login" method="post"> <table> <tr> <td> <label> 登录名: </label> </td> <td> <input type="text" id="loginName" name="loginName"> </td> </tr> <tr> <td> <label> 密 码: </label> </td> <td> <input type="password" id="passWord" name="passWord"> </td> </tr> <tr> <td> <input id="submit" type="submit" value="登录"> </td> </tr> </table> </form> </body> </html>
register.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>注册</title> </head> <body> <h4>注册页面</h4> <br> <form action="register" method="post"> <table> <tr> <td> <label> 登录名: </label> </td> <td> <input type="text" id="loginName" name="loginName"> </td> </tr> <tr> <td> <label> 密 码: </label> </td> <td> <input type="password" id="passWord" name="passWord"> </td> </tr> <tr> <td> <label> 姓 名: </label> </td> <td> <input type="text" id="userName" name="userName"> </td> </tr> <tr> <td> <input id="submit" type="submit" value="注册"> </td> </tr> </table> </form> </body> </html>
welcome.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>欢迎登录</title> </head> <body> <h4>欢迎[${requestScope.user.userName }]登录</h4> </body> </html>
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <!-- 定义 Spring MVC 的前端控制器 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/config/springmvc-config.xml </param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <!-- 让 Spring MVC 的前端控制器拦截所有请求 --> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!-- 乱码过滤器 --> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>测试接收JSON格式的数据</title> <script type="text/javascript" src="js/jquery-1.11.0.min.js"></script> <script type="text/javascript" src="js/json2.js"></script> <script type="text/javascript"> $(document).ready(function(){ testRequestBody(); }); function testRequestBody(){ $.ajax("${pageContext.request.contextPath}/json/testRequestBody",// 发送请求的 URL 字符串。 { dataType : "json", // 预期服务器返回的数据类型。 type : "post", // 请求方式 POST 或 GET contentType:"application/json", // 发送信息至服务器时的内容编码类型 // 发送到服务器的数据。 data:JSON.stringify({id : 1, name : "你们都是笨蛋"}), async: true , // 默认设置下,所有请求均为异步请求。如果设置为 false ,则发送同步请求 // 请求成功后的回调函数。 success :function(data){ console.log(data); $("#id").html(data.id); $("#name").html(data.name); $("#author").html(data.author); }, // 请求出错时调用的函数 error:function(){ alert("数据发送失败"); } }); } </script> </head> <body> 编号:<span id="id"></span><br> 书名:<span id="name"></span><br> 作者:<span id="author"></span><br> </body> </html>
所有用到的包如下:
我们有两个方法来进行软件设计:一个是让其足够的简单以至于让BUG无法藏身;另一个就是让其足够的复杂,让人找不到BUG。前者更难一些。
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