读取项目中静态资源文件下的所有文件，比如是所有图片

请求需要传入文件夹路径

这是后台代码
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.ArrayList;

import javax.servlet.ServletException;
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.ResponseBody;

/**
* 文件预览辅助类
* @author zhy
* 
*/
@Controller
public class FileBrowseUtil {
   /**
    * 通过ajax请求获取传入的文件路径里边的文件fileList数组
    * @param req
    * @param resp
    * @param params 文件夹路径参数
    * @return
    * @throws ServletException
    * @throws IOException
    * @throws MalformedURLException
    */
   @RequestMapping("/getFileList")
   @ResponseBody
   protected ArrayList<String> CalculateGeoServlet(HttpServletRequest req,
           HttpServletResponse resp,String params) throws ServletException, IOException,
           MalformedURLException {
       ArrayList<String> fileList=new ArrayList<String>();
       String dir = req.getSession().getServletContext().getRealPath(params);
       fileList=getFiles(dir);
       return fileList;
   }
   /**
    * 通过递归得到某一路径下所有的目录及其文件
    * @param filePath 文件路径
    * @return
    */
   public ArrayList<String> getFiles(String filePath) {
       ArrayList<String> fileList = new ArrayList<String>();
       File root = new File(filePath);
       File[] files = root.listFiles();
       for (File file : files) {
           if (file.isDirectory()) {
               /*
                * 递归调用
                */
               getFiles(file.getAbsolutePath());
               fileList.add(file.getAbsolutePath());
           } else {
               String picPathStr = file.getAbsolutePath();
//             String picPathStr = file.getAbsolutePath().replaceAll("\\\\","//");
               fileList.add(getFileNameWithSuffix(picPathStr));
           }
       }
       /*for(String str:fileList){
           System.out.println(str);
       }*/
       return fileList;
   }
   /**     
    * 保留文件名及后缀     
    */
   public String getFileNameWithSuffix(String pathandname) {                
       int start = pathandname.lastIndexOf("\\");        
       if (start != -1 ) {            
           return pathandname.substring(start + 1);        
       } else {            
           return null;        
       }            
   }    
   /**        
    * 仅保留文件名不保留后缀        
    */        
   public String getFileName(String pathandname) {        
       int start = pathandname.lastIndexOf("\\");        
       int end = pathandname.lastIndexOf(".");        
       if (start != -1 && end != -1) {            
           return pathandname.substring(start + 1, end);        
       } else {            
           return null;        
       }            
   }    
}