当客户端通过get或post请求发送来的参数通过Controller中方法的参数接受，叫做参数绑定
Controller方法的返回值1：返回void类型
[java] view plain copy
1. @RequestMapping(“/test_void.action”)
2. public void controller01(HttpServletRequest request,HttpServletResponse response) throws
3. <span style=”margin:0px;padding:0px;white-space:pre;”> </span>request.setCharacterEncoding(“utf-8”);
4. <span style=”margin:0px;padding:0px;white-space:pre;”> </span>String username = request.getParameter(“username”);//通过HttpServletRequest获得请求参数
5. ”用户名:”+username);
6. ”username”,username);
7. new
8. <span style=”margin:0px;padding:0px;white-space:pre;”> </span>u.setUsername(username);
9. <span style=”margin:0px;padding:0px;white-space:pre;”> </span>userService.insertUser(u);//插入数据库
10. ”/WEB-INF/jsp/success.jsp”).forward(request, response);//转发
11. }
@RequestMapping("/test_void.action")
public void controller01(HttpServletRequest request,HttpServletResponse response) throws Exception{
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");//通过HttpServletRequest获得请求参数
System.out.println("用户名:"+username);
request.setAttribute("username",username);
User u = new User();
u.setUsername(username);
userService.insertUser(u);//插入数据库
request.getRequestDispatcher("/WEB-INF/jsp/success.jsp").forward(request, response);//转发
}
Controller方法的返回值2：返回ModelAndView
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1. @RequestMapping(“/test_modelandview.action”)
2. public ModelAndView controller02(HttpServletRequest request) throws
3. ”utf-8”);//转码，Tomcat默认是iso-8859-1
4. ”username”);
5. ”用户名:”+username);
6. new ModelAndView();<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//new一个ModelAndView
7. ”username”,username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//相当于request.setAttribute(attrName,attrValue);
8. ”WEB-INF/jsp/success.jsp”);//视图跳转
9. return
10. }
@RequestMapping("/test_modelandview.action")
public ModelAndView controller02(HttpServletRequest request) throws Exception{
request.setCharacterEncoding("utf-8");//转码，Tomcat默认是iso-8859-1
String username = request.getParameter("username");
System.out.println("用户名:"+username);
ModelAndView modelAndView = new ModelAndView(); //new一个ModelAndView
modelAndView.addObject("username",username); //相当于request.setAttribute(attrName,attrValue);
modelAndView.setViewName("WEB-INF/jsp/success.jsp");//视图跳转
return modelAndView;
}
Controller方法的返回值3：返回String类型（逻辑视图）
[java] view plain copy
1. @RequestMapping(“/test_string.action”)
2. public String controller03(HttpServletRequest request) throws
3. ”utf-8”);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//转码
4. ”username”);
5. ”username”,username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//设置请求参数
6. ”用户名:”+username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>
7. return “/WEB-INF/jsp/success.jsp”;<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//返回String类型，代表逻辑视图
8. }
@RequestMapping("/test_string.action")
public String controller03(HttpServletRequest request) throws Exception{
request.setCharacterEncoding("utf-8"); //转码
String username = request.getParameter("username");
request.setAttribute("username",username); //设置请求参数
System.out.println("用户名:"+username);
return "/WEB-INF/jsp/success.jsp"; //返回String类型，代表逻辑视图
}
Controller方法的返回值4：方法的参数是Model，返回值是String类型（逻辑视图）
[html] view plain copy
1. @RequestMapping(“/test_model.action”)
2. public String controller04(HttpServletRequest request,Model model) throws Exception{
3. <span style=“margin:0px;padding:0px;white-space:pre;”> </span>request.setCharacterEncoding(“utf-8”);
4. <span style=“margin:0px;padding:0px;white-space:pre;”> </span>String username = request.getParameter(“username”);
5. <span style=“margin:0px;padding:0px;white-space:pre;”> </span>model.addAttribute(“username”, username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//等价于request.setAttribute(attrName,attrValue);
6. <span style=“margin:0px;padding:0px;white-space:pre;”> </span>System.out.println(“用户名:”+username);
7. <span style=“margin:0px;padding:0px;white-space:pre;”> </span>return ”/WEB-INF/jsp/success.jsp”;<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//返回String类型，跳转到逻辑视图
8. }
@RequestMapping("/test_model.action")
public String controller04(HttpServletRequest request,Model model) throws Exception{
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
model.addAttribute("username", username); //等价于request.setAttribute(attrName,attrValue);
System.out.println("用户名:"+username);
return "/WEB-INF/jsp/success.jsp"; //返回String类型，跳转到逻辑视图
}
Controller方法的返回值5：返回重定向redirect后的逻辑视图名
[java] view plain copy
1. @RequestMapping(“/test_redirect.action”)
2. public String controller05(HttpServletRequest request) throws
3. ”utf-8”);
4. ”username”);
5. new
6. u.setUsername(username);
7. userService.insertUser(u);
8. ”username”,username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//由于是redirect，所以请求参数失效
9. return “redirect:/controller/test_model.action”;//redirect：重定向到一个Controller里
10. }
@RequestMapping("/test_redirect.action")
public String controller05(HttpServletRequest request) throws Exception{
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
User u = new User();
u.setUsername(username);
userService.insertUser(u);
request.setAttribute("username",username); //由于是redirect，所以请求参数失效
return "redirect:/controller/test_model.action";//redirect：重定向到一个Controller里
}
Controller方法的返回值6：返回farward转发后的逻辑视图名
[java] view plain copy
1. @RequestMapping(“/test_forword.action”)
2. public String controller06(HttpServletRequest request) throws
3. ”utf-8”);
4. ”username”);
5. new
6. u.setUsername(username);
7. userService.insertUser(u);
8. ”用户名:”+username);
9. ”username”,username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//由于是转发，所以请求参数有效
10. return “forward:/controller/test_model.action”;//转发，跳转到一个Controller里
11. }
@RequestMapping("/test_forword.action")
public String controller06(HttpServletRequest request) throws Exception{
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
User u = new User();
u.setUsername(username);
userService.insertUser(u);
System.out.println("用户名:"+username);
request.setAttribute("username",username); //由于是转发，所以请求参数有效
return "forward:/controller/test_model.action";//转发，跳转到一个Controller里
}
参数绑定
参数绑定的第一种方法：绑定普通类型
[java] view plain copy
1. //参数绑定的第一种方法：客户端提交的请求的input的name属性会和Controller方法的参数名字一致才会绑定
2. @RequestMapping(“/test_parambinding01.action”)
3. public void controller07(HttpServletRequest request,HttpServletResponse response,String username,String password) throws
4. //必须进行转码
5. new String(username.getBytes(“iso8859-1”),“UTF-8”);
6. ”username”,username);
7. ”/WEB-INF/jsp/success.jsp”).forward(request, response);
8. }
//参数绑定的第一种方法：客户端提交的请求的input的name属性会和Controller方法的参数名字一致才会绑定
@RequestMapping("/test_parambinding01.action")
public void controller07(HttpServletRequest request,HttpServletResponse response,String username,String password) throws Exception{
//必须进行转码
username = new String(username.getBytes("iso8859-1"),"UTF-8");
request.setAttribute("username",username);
request.getRequestDispatcher("/WEB-INF/jsp/success.jsp").forward(request, response);
}
参数绑定的第二种方法：绑定pojo类
[java] view plain copy
1. //参数绑定的第二种方法:客户端的input标签的那么属性必须和User的属性名对应才可以映射成功
2. @RequestMapping(“/test_parambinding02.action”)
3. public ModelAndView controller08(HttpServletRequest request,User user) throws
4. //必须进行转码
5. new String(user.getUsername().getBytes(“iso-8859-1”),“utf-8”));
6. userService.insertUser(user);
7. new
8. ”utf-8”);
9. ”username”,user.getUsername());
10. ”password”,user.getPassword());
11. ”/WEB-INF/jsp/success.jsp”);
12. return
13. }
//参数绑定的第二种方法:客户端的input标签的那么属性必须和User的属性名对应才可以映射成功
@RequestMapping("/test_parambinding02.action")
public ModelAndView controller08(HttpServletRequest request,User user) throws Exception{
//必须进行转码
user.setUsername(new String(user.getUsername().getBytes("iso-8859-1"),"utf-8"));
userService.insertUser(user);
ModelAndView modelAndView = new ModelAndView();
request.setCharacterEncoding("utf-8");
modelAndView.addObject("username",user.getUsername());
modelAndView.addObject("password",user.getPassword());
modelAndView.setViewName("/WEB-INF/jsp/success.jsp");
return modelAndView;
}
参数绑定的第三种方法：当input的name与controller的参数名不一致时，可以采用@RequestParam注解
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1. @RequestMapping(“test_RequestParam.action”)
2. //将客户端的请求参数”username”与”uname”绑定
3. public ModelAndView controller09(@RequestParam(value=“username”) String uname,@RequestParam(value=“password”)String pwd) throws
4. new String(uname.getBytes(“iso-8859-1”),“utf-8”);
5. new
6. ”username”,uname);
7. ”/WEB-INF/jsp/success.jsp”);
8. return
9. }
@RequestMapping("test_RequestParam.action")
//将客户端的请求参数"username"与"uname"绑定
public ModelAndView controller09(@RequestParam(value="username") String uname,@RequestParam(value="password")String pwd) throws Exception{
uname = new String(uname.getBytes("iso-8859-1"),"utf-8");
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("username",uname);
modelAndView.setViewName("/WEB-INF/jsp/success.jsp");
return modelAndView;
}
</div>
当客户端通过get或post请求发送来的参数通过Controller中方法的参数接受，叫做参数绑定
Controller方法的返回值1：返回void类型
[java] view plain copy
1. @RequestMapping(“/test_void.action”)
2. public void controller01(HttpServletRequest request,HttpServletResponse response) throws
3. <span style=”margin:0px;padding:0px;white-space:pre;”> </span>request.setCharacterEncoding(“utf-8”);
4. <span style=”margin:0px;padding:0px;white-space:pre;”> </span>String username = request.getParameter(“username”);//通过HttpServletRequest获得请求参数
5. ”用户名:”+username);
6. ”username”,username);
7. new
8. <span style=”margin:0px;padding:0px;white-space:pre;”> </span>u.setUsername(username);
9. <span style=”margin:0px;padding:0px;white-space:pre;”> </span>userService.insertUser(u);//插入数据库
10. ”/WEB-INF/jsp/success.jsp”).forward(request, response);//转发
11. }
@RequestMapping("/test_void.action")
public void controller01(HttpServletRequest request,HttpServletResponse response) throws Exception{
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");//通过HttpServletRequest获得请求参数
System.out.println("用户名:"+username);
request.setAttribute("username",username);
User u = new User();
u.setUsername(username);
userService.insertUser(u);//插入数据库
request.getRequestDispatcher("/WEB-INF/jsp/success.jsp").forward(request, response);//转发
}
Controller方法的返回值2：返回ModelAndView
[java] view plain copy
1. @RequestMapping(“/test_modelandview.action”)
2. public ModelAndView controller02(HttpServletRequest request) throws
3. ”utf-8”);//转码，Tomcat默认是iso-8859-1
4. ”username”);
5. ”用户名:”+username);
6. new ModelAndView();<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//new一个ModelAndView
7. ”username”,username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//相当于request.setAttribute(attrName,attrValue);
8. ”WEB-INF/jsp/success.jsp”);//视图跳转
9. return
10. }
@RequestMapping("/test_modelandview.action")
public ModelAndView controller02(HttpServletRequest request) throws Exception{
request.setCharacterEncoding("utf-8");//转码，Tomcat默认是iso-8859-1
String username = request.getParameter("username");
System.out.println("用户名:"+username);
ModelAndView modelAndView = new ModelAndView(); //new一个ModelAndView
modelAndView.addObject("username",username); //相当于request.setAttribute(attrName,attrValue);
modelAndView.setViewName("WEB-INF/jsp/success.jsp");//视图跳转
return modelAndView;
}
Controller方法的返回值3：返回String类型（逻辑视图）
[java] view plain copy
1. @RequestMapping(“/test_string.action”)
2. public String controller03(HttpServletRequest request) throws
3. ”utf-8”);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//转码
4. ”username”);
5. ”username”,username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//设置请求参数
6. ”用户名:”+username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>
7. return “/WEB-INF/jsp/success.jsp”;<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//返回String类型，代表逻辑视图
8. }
@RequestMapping("/test_string.action")
public String controller03(HttpServletRequest request) throws Exception{
request.setCharacterEncoding("utf-8"); //转码
String username = request.getParameter("username");
request.setAttribute("username",username); //设置请求参数
System.out.println("用户名:"+username);
return "/WEB-INF/jsp/success.jsp"; //返回String类型，代表逻辑视图
}
Controller方法的返回值4：方法的参数是Model，返回值是String类型（逻辑视图）
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1. @RequestMapping(“/test_model.action”)
2. public String controller04(HttpServletRequest request,Model model) throws Exception{
3. <span style=“margin:0px;padding:0px;white-space:pre;”> </span>request.setCharacterEncoding(“utf-8”);
4. <span style=“margin:0px;padding:0px;white-space:pre;”> </span>String username = request.getParameter(“username”);
5. <span style=“margin:0px;padding:0px;white-space:pre;”> </span>model.addAttribute(“username”, username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//等价于request.setAttribute(attrName,attrValue);
6. <span style=“margin:0px;padding:0px;white-space:pre;”> </span>System.out.println(“用户名:”+username);
7. <span style=“margin:0px;padding:0px;white-space:pre;”> </span>return ”/WEB-INF/jsp/success.jsp”;<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//返回String类型，跳转到逻辑视图
8. }
@RequestMapping("/test_model.action")
public String controller04(HttpServletRequest request,Model model) throws Exception{
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
model.addAttribute("username", username); //等价于request.setAttribute(attrName,attrValue);
System.out.println("用户名:"+username);
return "/WEB-INF/jsp/success.jsp"; //返回String类型，跳转到逻辑视图
}
Controller方法的返回值5：返回重定向redirect后的逻辑视图名
[java] view plain copy
1. @RequestMapping(“/test_redirect.action”)
2. public String controller05(HttpServletRequest request) throws
3. ”utf-8”);
4. ”username”);
5. new
6. u.setUsername(username);
7. userService.insertUser(u);
8. ”username”,username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//由于是redirect，所以请求参数失效
9. return “redirect:/controller/test_model.action”;//redirect：重定向到一个Controller里
10. }
@RequestMapping("/test_redirect.action")
public String controller05(HttpServletRequest request) throws Exception{
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
User u = new User();
u.setUsername(username);
userService.insertUser(u);
request.setAttribute("username",username); //由于是redirect，所以请求参数失效
return "redirect:/controller/test_model.action";//redirect：重定向到一个Controller里
}
Controller方法的返回值6：返回farward转发后的逻辑视图名
[java] view plain copy
1. @RequestMapping(“/test_forword.action”)
2. public String controller06(HttpServletRequest request) throws
3. ”utf-8”);
4. ”username”);
5. new
6. u.setUsername(username);
7. userService.insertUser(u);
8. ”用户名:”+username);
9. ”username”,username);<span style=“margin:0px;padding:0px;white-space:pre;”> </span>//由于是转发，所以请求参数有效
10. return “forward:/controller/test_model.action”;//转发，跳转到一个Controller里
11. }
@RequestMapping("/test_forword.action")
public String controller06(HttpServletRequest request) throws Exception{
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
User u = new User();
u.setUsername(username);
userService.insertUser(u);
System.out.println("用户名:"+username);
request.setAttribute("username",username); //由于是转发，所以请求参数有效
return "forward:/controller/test_model.action";//转发，跳转到一个Controller里
}
参数绑定
参数绑定的第一种方法：绑定普通类型
[java] view plain copy
1. //参数绑定的第一种方法：客户端提交的请求的input的name属性会和Controller方法的参数名字一致才会绑定
2. @RequestMapping(“/test_parambinding01.action”)
3. public void controller07(HttpServletRequest request,HttpServletResponse response,String username,String password) throws
4. //必须进行转码
5. new String(username.getBytes(“iso8859-1”),“UTF-8”);
6. ”username”,username);
7. ”/WEB-INF/jsp/success.jsp”).forward(request, response);
8. }
//参数绑定的第一种方法：客户端提交的请求的input的name属性会和Controller方法的参数名字一致才会绑定
@RequestMapping("/test_parambinding01.action")
public void controller07(HttpServletRequest request,HttpServletResponse response,String username,String password) throws Exception{
//必须进行转码
username = new String(username.getBytes("iso8859-1"),"UTF-8");
request.setAttribute("username",username);
request.getRequestDispatcher("/WEB-INF/jsp/success.jsp").forward(request, response);
}
参数绑定的第二种方法：绑定pojo类
[java] view plain copy
1. //参数绑定的第二种方法:客户端的input标签的那么属性必须和User的属性名对应才可以映射成功
2. @RequestMapping(“/test_parambinding02.action”)
3. public ModelAndView controller08(HttpServletRequest request,User user) throws
4. //必须进行转码
5. new String(user.getUsername().getBytes(“iso-8859-1”),“utf-8”));
6. userService.insertUser(user);
7. new
8. ”utf-8”);
9. ”username”,user.getUsername());
10. ”password”,user.getPassword());
11. ”/WEB-INF/jsp/success.jsp”);
12. return
13. }
//参数绑定的第二种方法:客户端的input标签的那么属性必须和User的属性名对应才可以映射成功
@RequestMapping("/test_parambinding02.action")
public ModelAndView controller08(HttpServletRequest request,User user) throws Exception{
//必须进行转码
user.setUsername(new String(user.getUsername().getBytes("iso-8859-1"),"utf-8"));
userService.insertUser(user);
ModelAndView modelAndView = new ModelAndView();
request.setCharacterEncoding("utf-8");
modelAndView.addObject("username",user.getUsername());
modelAndView.addObject("password",user.getPassword());
modelAndView.setViewName("/WEB-INF/jsp/success.jsp");
return modelAndView;
}
参数绑定的第三种方法：当input的name与controller的参数名不一致时，可以采用@RequestParam注解
[java] view plain copy
1. @RequestMapping(“test_RequestParam.action”)
2. //将客户端的请求参数”username”与”uname”绑定
3. public ModelAndView controller09(@RequestParam(value=“username”) String uname,@RequestParam(value=“password”)String pwd) throws
4. new String(uname.getBytes(“iso-8859-1”),“utf-8”);
5. new
6. ”username”,uname);
7. ”/WEB-INF/jsp/success.jsp”);
8. return
9. }
@RequestMapping("test_RequestParam.action")
//将客户端的请求参数"username"与"uname"绑定
public ModelAndView controller09(@RequestParam(value="username") String uname,@RequestParam(value="password")String pwd) throws Exception{
uname = new String(uname.getBytes("iso-8859-1"),"utf-8");
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("username",uname);
modelAndView.setViewName("/WEB-INF/jsp/success.jsp");
return modelAndView;
}
</div>本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
