参数传递
ModelAndView传递
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编写controller
@Controller @RequestMapping("/account") public class AccountController { //也可以不创建ModelAndView,直接在参数中指定 @RequestMapping(value = "/findAccount9") public ModelAndView findAccount9(ModelAndView mv) { mv.addObject("msg", "欢迎你 springmvc"); mv.setViewName("success"); return mv; } }
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在index.jsp里面定义超链接
<a href="/account/findAccount9">ModelAndView参数传递</a>
Model传递
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编写controller
@Controller @RequestMapping("/account") public class AccountController { @RequestMapping(value = "/findAccount10") public String findAccount10(Model model) { model.addAttribute("msg", "欢迎你 springmvc"); return "success"; } }
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在index.jsp里面定义超链接
<a href="/account/findAccount10">Model参数传递</a>
ServletAPI传递
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编写controller
@Controller @RequestMapping("/account") public class AccountController { @RequestMapping("/findAccount11") public String findAccount11(HttpServletRequest request, HttpServletResponse response){ request.setAttribute("msg","欢迎你 springmvc"); return "success"; } }
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在index.jsp里面定义超链接
<a href="/account/findAccount11">ServletAPI传递</a>
JSON数据处理
添加json依赖
springmvc 默认使用jackson作为json类库,不需要修改applicationContext-servlet.xml任何配置,只需引入以下类库springmvc就可以处理json数据:
<!--spring-json依赖--> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.0</version> </dependency>
注解
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@RequestBody:作用是接收前端ajax传递给后端的json字符串,并将json格式的数据转为java对象
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@ResponseBody:作用是将java对象转为json格式的数据传递给前台ajax
案例
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编写controller
@Controller @RequestMapping("/account") public class AccountController { @RequestMapping("/saveAccount2") @ResponseBody public Map saveAccount2(@RequestBody Account account){ Map<String, Object> map = new HashMap<String, Object>(); map.put("status",200); map.put("msg",account); return map; } }
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在index.jsp里面定义ajax请求
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添加按钮
<input type="button" value="测试ajax请求json和响应json" id="testJson"/>
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引入js库文件
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
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编写ajax代码
<script type="text/javascript"> $(function(){ $("#testJson").click(function(){ $.ajax({ type:"post", url:"/account/saveAccount2", contentType:"application/json;charset=UTF-8", data:'{"id":1,"name":"张二狗","money":999.0}', success:function(data){ if(data.status == 200){ alert(data.msg.name); alert(data.msg.money); } } }) }); }) </script>
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测试