ajax上傳檔案，spring mvc獲取檔案並處理，通過頁面按鈕傳送url,由後臺控制檔案下載
前端頁面程式碼：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>加密與解密</title>
<link rel="stylesheet" href="css/bootstrap.min.css" />
<link rel="stylesheet" href="css/encrypt.css" />
<script type="text/javascript" src="js/encrypt.js" ></script>
<script type="text/javascript" src="js/jquery.min.js" ></script>
</head>
<body>
<form class="inpform" id="uploadForm" enctype="multipart/form-data">
<div class="col-lg-6">
<div class="input-group input-center">
<input id="t1" type="text" class="form-control" placeholder="請選擇需要加密的檔案">
<span class="input-group-btn">
<input type="file" id="file" name="mpfile" onchange="getFilePath()" style="filter:alpha(opacity=0);opacity:0;width: 0;height: 0;"/>
<button id="bj1" class="btn btn-default" type="button" onclick="selectFile();">請選擇</button>
</span>
</div>
<div class="input-group input-center">
<input id="t2" name="key" type="password" class="form-control" placeholder="請選輸入金鑰（或隨機生成）">
<span class="input-group-btn">
<button id="bj2" class="btn btn-default" type="button" onclick="KeyRandom()">隨機生成</button>
</span>
</div>
<div class="radio">
<label class="radio-inline">
<input type="radio" name="optionsRadiosinline" id="optionsRadios1" value="1" checked> 加密
</label>
<label class="radio-inline">
<input type="radio" name="optionsRadiosinline" id="optionsRadios2" value="2"> 解密
</label>
</div>
<div class="radio">
<label class="radio-inline">
<input type="radio" name="optionsRadiosinline2" id="optionsRadios3" value="3" checked> ECB模式
</label>
<label class="radio-inline">
<input type="radio" name="optionsRadiosinline2" id="optionsRadios4" value="4"> CBC模式
</label>
</div>
<div class="radio">
<label class="radio-inline">
<input type="radio" name="optionsRadiosinline3" id="optionsRadios5" value="5" checked> 操作後上傳
</label>
<label class="radio-inline">
<input type="radio" name="optionsRadiosinline3" id="optionsRadios6" value="6"> 操作後下載
</label>
</div>
<div class="button">
<button id="btn1" type="button" class="btn btn-primary" onclick="Save()">上傳</button>
</div>
<div class="button">
<span>請先上傳檔案再下載！</span>
</div>
<div class="button">
<button id="btn2" type="button" class="btn btn-primary" onclick="DownLoad()">下載</button>
</div>
</div>
</form>
</body>
</html>spring mvc 後臺程式碼：
package com.cczu.sm.controller;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.FileUtils;
import org.bouncycastle.util.encoders.Hex;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
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 org.springframework.web.multipart.MultipartFile;
import com.cczu.sm.entity.SM3Digest;
import com.cczu.sm.entity.SM4;
import com.cczu.sm.entity.SM4Utils;
import com.cczu.sm.entity.SM4_Context;
import com.cczu.sm.entity.Util;
@Controller
public class SmController {
@RequestMapping("/sm")
@ResponseBody
public void getFile(String optionsRadiosinline3,
String optionsRadiosinline2, String optionsRadiosinline,
String key, MultipartFile mpfile) throws Exception {
String filename = mpfile.getOriginalFilename();
String mykey = key;
String myoption = optionsRadiosinline;
System.out.println("金鑰：" + mykey + "\n" + "檔名:" + filename + "\n"
+ "功能選擇：" + myoption);
byte[] input = mpfile.getBytes();
//SM3雜湊金鑰
byte[] md = new byte[32];
byte[] msg1 = mykey.getBytes();
SM3Digest sm3 = new SM3Digest();
sm3.update(msg1, 0, msg1.length);
sm3.doFinal(md, 0);
String s = new String(Hex.encode(md)).substring(0, 16).toUpperCase();
// System.out.println("雜湊金鑰：" + s);
//SM4加密
//optionsRadiosinline等於1加密，等於2解密
//optionsRadiosinline2等於3ECB模式，等於4CBC模式
if (optionsRadiosinline.equals("1")) {
//SM4設定加密金鑰
SM4 s4 = new SM4();
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = SM4.SM4_ENCRYPT;
byte[] keyBytes = s.getBytes();
s4.sm4_setkey_enc(ctx, keyBytes);
if (optionsRadiosinline2.equals("3")) {
//ECB模式
String path = "";
//等於5上傳儲存伺服器，等於6上傳操作後下載
if (optionsRadiosinline3.equals("5")) {
path = "F:\\MyEclipse 9Workspaces\\sm\\smfile\\";
} else {
path = "F:\\MyEclipse 9Workspaces\\sm\\smfiledown\\";
}
File file = new File(path + filename + ".encecb");
if (file.exists()) {
file.delete();
file.createNewFile();
}
FileOutputStream out = new FileOutputStream(file);
out.write(s4.sm4_crypt_ecb(ctx, input), 0,
s4.sm4_crypt_ecb(ctx, input).length);
out.close();
} else {
//CBC模式
String path = "";
if (optionsRadiosinline3.equals("5")) {
path = "F:\\MyEclipse 9Workspaces\\sm\\smfile\\";
} else {
path = "F:\\MyEclipse 9Workspaces\\sm\\smfiledown\\";
}
File file = new File(path + filename + ".enccbc");
FileOutputStream out = new FileOutputStream(file);
out.write(s4.sm4_crypt_cbc(ctx, keyBytes, input), 0,
s4.sm4_crypt_cbc(ctx, keyBytes, input).length);
out.close();
}
} else {
//解密操作
//SM4設定加密金鑰
SM4 s4 = new SM4();
SM4_Context ctx = new SM4_Context();
ctx.isPadding = true;
ctx.mode = SM4.SM4_DECRYPT;
byte[] keyBytes = s.getBytes();
s4.sm4_setkey_dec(ctx, keyBytes);
if (optionsRadiosinline2.equals("3")) {
//ECB模式
String path = "";
//等於5上傳儲存伺服器，等於6上傳操作後下載
if (optionsRadiosinline3.equals("5")) {
path = "F:\\MyEclipse 9Workspaces\\sm\\smfile\\";
} else {
path = "F:\\MyEclipse 9Workspaces\\sm\\smfiledown\\";
}
File file = new File(path
+ filename.substring(0, filename.lastIndexOf(".")));
if (file.exists()) {
file.delete();
file.createNewFile();
}
FileOutputStream out = new FileOutputStream(file);
out.write(s4.sm4_crypt_ecb(ctx, input), 0,
s4.sm4_crypt_ecb(ctx, input).length);
out.close();
} else {
//CBC模式
String path = "";
if (optionsRadiosinline3.equals("5")) {
path = "F:\\MyEclipse 9Workspaces\\sm\\smfile\\";
} else {
path = "F:\\MyEclipse 9Workspaces\\sm\\smfiledown\\";
}
File file = new File(path
+ filename.substring(0, filename.lastIndexOf(".")));
FileOutputStream out = new FileOutputStream(file);
out.write(s4.sm4_crypt_cbc(ctx, keyBytes, input), 0,
s4.sm4_crypt_cbc(ctx, keyBytes, input).length);
out.close();
}
}
}
@RequestMapping("/sm/download")
public void downLoad(String file, HttpServletRequest request,
HttpServletResponse response) {
String path = "F:\\MyEclipse 9Workspaces\\sm\\smfiledown\\";
File ofile = new File(path);
for (File p : ofile.listFiles()) {
if (!p.isDirectory()) {
String fname = p.getName();
FileInputStream fs = null;
if (p.exists()) {
// response.setContentType("application/force-download");
try {
response.setHeader(
"Content-Disposition",
"attachment;fileName="
+ new String(fname.getBytes("utf-8"),
"iso_8859_1"));
fs = new FileInputStream(p);
byte[] buf = new byte[1024];
int len = 0;
ServletOutputStream o = response.getOutputStream();
while ((len = fs.read(buf)) != -1) {
o.write(buf, 0, len);
}
} catch (Exception e) {
e.printStackTrace();
request.setAttribute("error", " 쳣 ");
} finally {
try {
if (fs != null)
fs.close();
} catch (IOException e) {
request.setAttribute("error", " 쳣 ");
}
}
p.delete();
break;
}
}
}
}
}
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