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因为项目需要图片需要加密Base64，但是前端JS无法读取JS，所以需要在后台修改成普通的文件流。代码如下
public void startDownFTP1(HttpServletRequest request, HttpServletResponse response) throws Exception { FtpConfig list = null; flag1 = false; list = ftpConfigServiceI.findObjectByPK(null); FtpConfigController.connectFtp(list); String efilename = request.getParameter("efilename"); //2017年3月10日10:19:37 sfb String imagepath = request.getParameter("imagepath"); String img = FtpConfigController.downloadFile1(list, efilename, imagepath);// 下载ftp文件测试 ftp /图片名称/文件夹 已通过解密但是有Base64加密 Base64 endcoder=new Base64(); byte [] images;//返回图像 images=endcoder.decodeBase64(img);//Base64转换成byte数组 response.reset(); response.getOutputStream().write(images); flag1 = true; FtpConfigController.closeFtp(); }
例子说明一切先写单元测试吧：单元测试的代码如下：package test.com.cs;import com.cs.Base64Convert;import junit.framework.TestCase;import java.io.FileNotFoundException;import java.io.IOException;import java.util.logging.Logger;public class TestBase64Convert extends TestCase { Base64Convert baseCov = null; public TestBase64Convert(String s) { super(s); } protected void setUp() throws Exception { baseCov = new Base64Convert(); } protected void tearDown() throws Exception { super.tearDown(); } public void testIoToBase64() { try { String strBase64 = baseCov.ioToBase64(); //将 io 转换为 base64编码 System.out.println(">>> "+strBase64); baseCov.base64ToIo(strBase64); //将 base64编码转换为 io 文件流，生成一幅新图片 } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }}------------------------------------
package com.cs;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import java.io.*;public class Base64Convert { BASE64Decoder decoder = new BASE64Decoder(); public String ioToBase64() throws IOException { String fileName = "d:/gril.gif"; //源文件 String strBase64 = null; try { InputStream in = new FileInputStream(fileName); // in.available()返回文件的字节长度 byte[] bytes = new byte[in.available()]; // 将文件中的内容读入到数组中 in.read(bytes); strBase64 = new BASE64Encoder().encode(bytes); //将字节流数组转换为字符串 in.close(); } catch (FileNotFoundException fe) { fe.printStackTrace(); } catch (IOException ioe) { ioe.printStackTrace(); } return strBase64; } public void base64ToIo(String strBase64) throws IOException { String string = strBase64; String fileName = "d:/gril2.gif"; //生成的新文件 try { // 解码，然后将字节转换为文件 byte[] bytes = new BASE64Decoder().decodeBuffer(string); //将字符串转换为byte数组 ByteArrayInputStream in = new ByteArrayInputStream(bytes); byte[] buffer = new byte[1024]; FileOutputStream out = new FileOutputStream(fileName); int bytesum = 0; int byteread = 0; while ((byteread = in.read(buffer)) != -1) { bytesum += byteread; out.write(buffer, 0, byteread); //文件写操作 } } catch (IOException ioe) { ioe.printStackTrace(); } }}
执行截图：gril2.gif就是根据base64编码转换过来的，看到这个美女总裁，就说明你的程序成功了
一定要细心