[学习笔记]基于注解的spring3.0.x MVC学习笔记(六)
近期心情不太好，想起当初有些事情，继续springmvc的返回类型中带有redirect方式的使用，使用redirect方式返回跟有3种方式首先介绍第一种，代码如下：
1: @RequestMapping("/redirect")
2: public String testRedirect(ModelMap map){
3: // Map<String,Object> map = new HashMap<String, Object>();
4: map.put("testdata", "hello world!");
5: return "redirect:redirect.jsp";
6: }
使用redirect后他不会对modelmap中的数据进行调用request.setAttribute而采用带参数的形式进行传值,如下图:
再页面中调用request.getParameter("testdata")后得到以下结果:
jsp中的代码如下:
1: <%@ page language="java" contentType="text/html; charset=GB18030"
2: pageEncoding="GB18030"%>
3: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4: <html>
5: <head>
6: <meta http-equiv="Content-Type" content="text/html; charset=GB18030">
7: <title>跳转过来的jsp</title>
8: </head>
9: <body>
10: ${testdata}
11: :
12: <%=request.getParameter("testdata")+"----" %>
13: </body>
14: </html>
事实证明使用了redirect后就变成了带参传值.
另外一种则是可以返回一个链接代码如下:
片段代码1:
1: @RequestMapping(value="/redirect",method=RequestMethod.GET)
2: public String testRedirect(ModelMap map){
3: // Map<String,Object> map = new HashMap<String, Object>();
4: map.put("testdata", "redirect:hello world!");
5: return "redirect:forward";
6: }
片段代码2:
1: @RequestMapping("/forward")
2: public String testForword(ModelMap map){
3: // Map<String,Object> map = new HashMap<String, Object>();
4: map.put("testdata", "forward to:hello world!");
5: return "forward:collection1";
6: }
片段代码3
1: @RequestMapping("/collection1")
2: public Collection collection1() {
3: logger.info("collection is runing1");
4: List toys = new ArrayList();
5: toys.add("gg5555555");
6: toys.add(new UserBean(1, "a", "b"));
7: toys.add(new UserBean(2, "PSP", "2100"));
8:
9: return toys;
10: }
在浏览器上运行/redirect得到结果如下:
很明显运行/redirect跳转到forward中然后forward中又引用了collection1所以才变成这样.
最终一种则是跳转到外部链接:代码如下:
1: @RequestMapping(value="/redirect",method=RequestMethod.GET)
2: public String testRedirect(ModelMap map){
3: // Map<String,Object> map = new HashMap<String, Object>();
4: map.put("testdata", "redirect:hello world!");
5: return "redirect:http://blog.163.com/edwardlauxh";
6: }
可以直接跳转到外部链接中,跳转到外部链接,在modelmap中所保存的值也会一直带过去所对应的网站.
