根据第三方提供的图片或pdf的url进行预览

package com.hailian.modules.credit.common.controller;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URL;

import javax.servlet.http.HttpServletResponse;

import com.hailian.component.base.BaseProjectController;
import com.hailian.jfinal.component.annotation.ControllerBind;
import com.hailian.modules.credit.utils.FileTypeUtils;
import com.jfinal.kit.PropKit;
@ControllerBind(controllerKey = "/credit/commonFile")
public class FileViewAndUpController extends BaseProjectController{
    public void previewFileOnline() {
        HttpServletResponse response = getResponse();
        BufferedInputStream bis = null;
        OutputStream os = null;
        try {
            String path = getPara("url");//url地址
            path=new String(getPara("url").getBytes("iso8859-1"),"utf-8");
            String type = getPara("type");//获取类型
            response.reset(); // 非常重要
            response.setContentType("text/html; charset=UTF-8");
                if(!FileTypeUtils.isImg(type)){
                    response.setContentType("application/pdf");
                }else{
                    response.setContentType("image/jpeg");
                }
                URL url =new URL(path);
                    bis = new BufferedInputStream(url.openStream());
                os = response.getOutputStream();
                int count = 0;
                byte[] buffer = new byte[1024 * 1024];
                while ((count =bis.read(buffer)) != -1){
                    os.write(buffer, 0,count);
                }
                os.flush();
        }catch (Exception e) {
            e.printStackTrace();
            if (os !=null){
                try {
            os.close();
        } catch (IOException e2) {
            e2.printStackTrace();
        }
            }
            if (bis !=null){
                try {
            bis.close();
        } catch (IOException e2) {
            e2.printStackTrace();
        }
            }
        } finally {
                if (os !=null){
                    try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
                }
                if (bis !=null){
                    try {
                bis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
                }
            }
    }
}