springmvc细节篇

package cn.springmvc.controller;

import java.util.HashMap;
import java.util.Map;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.view.RedirectView;

@Controller("resultPageController")
@RequestMapping(value="result")
@Scope("prototype")
public class ResultPageController {
    
        /****************** 以forward方式返回结果页面  **************************/
        @RequestMapping(value="forward1")
        public String toViewByForwad1(){
            // 逻辑处理
            
            //  转发到index页面-->默认是转发
//            return "forward:index";=== return "index";
            return "index";
        }
        @RequestMapping(value="forward2")
        public ModelAndView toViewByForwar2(){
            
            // TODO:逻辑处理
            
            ModelAndView mv = new ModelAndView();
            mv.setViewName("index");// 默认是转发方式 可以在逻辑视图加forward：也可以不加
            // 用ModelAndView可以往request中添加参数
            mv.addObject("name","xxx");
            return mv;
        }
        
        
        /********************** 重定向 的三种方式  ******************************************/
        @RequestMapping(value="redirect")
        public String redirect(){
            // "forword:xxx"
            return "redirect:http://www.baidu.com?wd=xx";
        }
        
        @RequestMapping(value="redirect2")
        public ModelAndView redirect2(){
            ModelAndView mv = new ModelAndView();
            mv.setViewName("redirect:http://www.baidu.com");
            mv.addObject("wd","xx");
            return mv;
        }
        
        @RequestMapping(value="redirect3")
        public ModelAndView redirect3(){
            System.out.println("redirect3");
            ModelAndView mv = new ModelAndView();
            RedirectView redirectView = new RedirectView("http://www.baidu.com");
            Map<String,Object> params = new HashMap<String,Object>();
            params.put("wd", "xxxx");
            redirectView.setAttributesMap(params);
            mv.setView(redirectView);
            return mv;
        }
        
}

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.util.Streams;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.context.ServletContextAware;
import org.springframework.web.multipart.MultipartFile;

@Controller
@RequestMapping(value="file")
public class FileController implements ServletContextAware{
    
    private ServletContext servletContext;
    /**
     *  1.导入apache fileupload组件
     *  2.配置上传文件解析器
     *  
     *  上传单个文件
     * @param file
     * @return
     */
    @RequestMapping("upload")
    public String upload(@RequestParam("file") MultipartFile file){
        try {
            if(file.getSize()>0){ // 判断是否上传了文件
                System.out.println(">>>>>>>>> "+file.getOriginalFilename());
                String path = servletContext.getRealPath("/up/");
                Streams.copy(file.getInputStream(),
                             new FileOutputStream(path+File.separatorChar+file.getOriginalFilename()),
                             true);
            }
        } catch (FileNotFoundException e) {
            // TODO 异常处理
            e.printStackTrace();
        } catch (IOException e) {
            // TODO 异常处理
            e.printStackTrace();
        }
        return "index";
    }
    /**
     * 多文件上传
     * @param files
     * @return
     */
    @RequestMapping("uploads")
    public String uploads(@RequestParam("files")List<MultipartFile> files){
        try {
            System.out.println(">>>>>>>>>>>> "+files.size());
            String path = servletContext.getRealPath("/up/");
            MultipartFile file = null;
            for(int i=0;i<files.size();++i){
                file = files.get(i);
                if(file.getSize()>0) // 判断是否选择了文件
                Streams.copy(files.get(i).getInputStream(), 
                             new FileOutputStream(path+File.separatorChar+file.getOriginalFilename()),
                             true);
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "index";
    }
    
    /**
     * 文件下载
     */
    @RequestMapping(value="download")
    public void download(HttpServletResponse response){
        try {
            // 下载文件路径
            String filePath = this.servletContext.getRealPath("/download/lalalala.png");
            File file = new File(filePath);
            
            // 设置消息头
            response.setContentType("application/force-download");
            response.setHeader("Content-Disposition", "attachement;filename="+file.getName());
            response.setContentLength((int)file.length());
            
            // 写数据
            Streams.copy(new FileInputStream(file),response.getOutputStream(), true);
            
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    public void setServletContext(ServletContext servletContext) {
        this.servletContext = servletContext;
    }
    
    
}

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.alibaba.fastjson.JSON;

import cn.jack.domain.User;

@Controller("ajaxController")
@RequestMapping(value="ajax")
@Scope("prototype")
public class AjaxController {
    /**
     * 通过@RequestBody 获取request中的正文
     * @param requestBody
     * @return
     */
    @RequestMapping(value="doReq")
    public String process(@RequestBody String requestBody){
        System.out.println("----->>>>>>>> "+requestBody);
        // do other works
        return "index";
    }
    
    /**
     * 通过@ResponseBody 把数据写到response正文中
     * @return
     */
    @RequestMapping(value="doResp")
    @ResponseBody
    public String doResp(){
        System.out.println(">>>>>>>>>>:reponseBody");
        return "retVal";
    }
}

<script type="text/javascript" src="${ctx }/js/jquery-1.7.2.js"></script>
    <script type="text/javascript">
        function doResp(){
            var url = ‘${pageContext.request.contextPath}/ajax/doResp.action‘;
            $.post(url,function(data){
                alert(data);
            });
        }
        
</script>

  <body>
    <h4>@RequestBody: 将消息体绑定到使用了注解的变量,POST请求才有消息体</h4>
    <form action="${pageContext.request.contextPath}/ajax/doReq.action" method="post">
        <input type="text" name="name" id="name"/><br/>
        <input type="text" name="email" id="email"/><br/>
        <input type="submit" value="RequestBody" />
    </form>
    <br/>
    <h4>@ResponseBody：将内容写到response响应正文</h4>
    <button onclick="doResp();">ResonseBody</button>
</body>