spring3 mvc系列二：方法返回值的学习(注解版)

来源：互联网发布：江湖乐队知乎编辑：程序博客网时间：2024/06/07 05:29

接上篇，结构无大变化。

新建后台代码用以测试返回类型，在这里我新建的如下：

/**    * 项目名称：Spring3mvc demo   * Copyright ? 2010-2012 spartacus.org.cn All Rights Reserved   */  package cn.org.spartacus.spring; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.servlet.ModelAndView;/**   * Description: TODO   * @author hankaibo   * @date 2012-11-4   * @version v1.0   */  @Controller      //添加注解，这样配置文件就可以找到它了。  public class ReturnController {      }

1，测试ModelAndView类型的返回。在代码中添加如下方法：

/**   * 项目名称：Spring3mvc demo * Copyright ? 2010-2012 spartacus.org.cn All Rights Reserved */  package cn.org.spartacus.spring;  import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;/** * Description: TODO * @author hankaibo * @date 2012-11-4 * @version v1.0 */@Controller     //添加注解，这样配置文件就可以找到它了。@RequestMapping("return")public class ReturnController {    /**     * <p>Description: 测试一，返回ModelAndVie类型</p>     * @param      * @return ModelAndView     */    @RequestMapping(value="test1",method=RequestMethod.GET)    public ModelAndView test1(HttpServletRequest request,HttpServletResponse response){        ModelAndView mav=new ModelAndView();        mav.setViewName("mav");     //设置返回的文件名        mav.addObject("mav", "我的返回类型是ModelAndView.");        return mav;            }}

新建用于接受结果的前台页面mav.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><!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>mav</title></head><body>    ${mav }</body></html>

在success.jsp中添加触发条件

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><!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>hello world</title></head><body>    Hello world!    <c:redirect url="/app/return/test1" /></body></html>

地址栏输入测试，完成。

最后完整版如下，Java代码：

/**   * 项目名称：Spring3mvc demo * Copyright © 2010-2012 spartacus.org.cn All Rights Reserved */package cn.org.spartacus.spring;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.View;/** * Description: TODO *  * @author hankaibo * @date 2012-11-4 * @version v1.0 */@Controller// 添加注解，这样配置文件就可以找到它了。@RequestMapping("return")public class ReturnController {    /**     * <p>     * Description: 测试一，返回ModelAndVie类型     * </p>     *      * @param     * @return ModelAndView     */    @RequestMapping(value = "test1", method = RequestMethod.GET)    public ModelAndView test1(HttpServletRequest request, HttpServletResponse response) {        ModelAndView mav = new ModelAndView();        mav.setViewName("return/mav"); // 设置返回的文件名        mav.addObject("mav", "我的返回类型是ModelAndView.");        return mav;    }    /**     * <p>     * Description: 跳转到界面为 类路径@RequestMapping的值+方法@RequestMapping的值组成的页面     * </p>     *      * @param     * @return Model     * @throws     */    @RequestMapping("test2")    public Model test2(Model model) {        model.addAttribute("model", "我的返回类型是Model");        return model;    }    /**     * <p>     * Description: 跳转到界面为 类路径@RequestMapping的值+方法@RequestMapping的值组成的页面     * </p>     *      * @param     * @return ModelMap     * @throws     */    @RequestMapping("test3")    public ModelMap test3(ModelMap modelMap) {        modelMap.addAttribute("modelMap", "我的返回类型是ModelMap");        return modelMap;    }    /**     * <p>     * Description: 跳转到界面为 类路径@RequestMapping的值+方法@RequestMapping的值组成的页面     * </p>     *      * @param     * @return Map     * @throws     */    @RequestMapping("test4")    public Map test4(Map map) {        map.put("map", "我的返回类型是Map");        return map;    }        /**     * <p>Description: TODO 返回的页面可以为pdf,excel等。</p>     * @param      * @return View     * @throws     */    @RequestMapping("test5")    public View test5(){        return null;    }        /**     * <p>Description: 跳转到界面为 类路径@RequestMapping的值+方法@RequestMapping的值组成的页面</p>     * @param      * @return void     * @throws     */    @RequestMapping("test6")    public void test6(Map<String,Object> map){        map.put("void","我的返回类型是void");    }    /**     * <p>Description: TODO</p>     * @param      * @return String     * @throws     */    @RequestMapping("test7")    public String test7(Map<String,Object> map){        map.put("string", "我的返回类型是String");        return "return/string";    }}

jsp代码如下：

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><!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>hello world</title></head><body>    Hello world!    <c:redirect url="/app/return/test1" />    <%--     <c:redirect url="/app/return/test2" />    <c:redirect url="/app/return/test3" />    <c:redirect url="/app/return/test4" />    <c:redirect url="/app/return/test5" />    <c:redirect url="/app/return/test6" />    <c:redirect url="/app/return/test7" />     --%></body></html>

最后附上代码结构图：