java 模擬html表單(form)提交數據包含多文件上傳表單提交 for j2me j2s

時間 2019-11-15

標籤 java 模擬 html 表單 form 提交數據包含文件上傳 j2me j2s 欄目 Java 简体版

原文原文鏈接

咱們先來看一下用html寫簡單的表單(form)是什麼樣的，以下： html

[xhtml] view plain copy

<html>
<head>
<title>上傳文件測試頁面</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
</head>
<body>
<form method="post" action="http://your_address" enctype="multipart/form-data">
<input type='hidden' id="do" name="do" value="justDoIt"/>
<fieldset>
<label> 名稱：</label><input type='text' id='myname' name='myname' size='35' maxlength='255'><br/>
<label>上傳文件：</label><input type='file' id='uploadFile' name="uploadFile" size='35' maxlength='255'><br/>
<label>描述：</label><br/>
<textarea rows="5" cols="100" id='description' name='description' >
</fieldset>
<fieldset>
<input type='submit' id='submit'/>
<input type='reset' id='reset'/>
</fieldset>
</form>
</body>
</html>

假設服務器都作好的狀況下，咱們點擊"提交"，就能完成文件上傳工作。 java

需求：數組

用java 模擬html表單(form)提交數據包含多文件上傳表單提交。服務器

不用多說，碼農的風格直接上代碼，說明全在代碼上了，用法參見main方法s app

[java] view plain copy

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.List;
import java.net.HttpURLConnection;
import java.net.URL;
/**
* 模擬html表單提交數據，喜歡研究的同窗能夠把代碼優化一下。
*/
public class HttpMultipartRequest {
//每一個post參數之間的分隔
static final String BOUNDARY = "----------V2ymHFg03ehbqgZCaKO6jy";
public static void main(String[] args) {
List<String[]> stringParams = new ArrayList<String[]>();
stringParams.add(new String[]{"do", "justDoIt"});
stringParams.add(new String[]{"myname", "aa我是一個測試cc123"});
stringParams.add(new String[]{"description", "bb我是碼農我是一個測試我是一個測試cc567"});
List<String[]> fileParams = new ArrayList<String[]>();
fileParams.add(new String[]{"uploadFile", "我是碼農的一個測試.zip", "application/zip", "D://我是一個測試.zip"});
HttpMultipartRequest req = new HttpMultipartRequest("http://your_address", stringParams, fileParams);
try {
byte[] response = req.sendPost();
System.out.println(new String(response));
} catch (Exception e) {
e.printStackTrace();
}
}
// 鏈接的地址
private String urlStr;
// 文字post項集 strParams 1:key 2:value
private List<String[]> strParams;
// 文件的post項集 fileParams 1:fileField, 2.fileName, 3.fileType, 4.filePath
private List<String[]> fileParams;
/**
* 創建一個request鏈接
* @param urlStr
* @param strParams 1:key 2:value
* @param fileParams 1:fileField, 2.fileName, 3.fileType, 4.filePath
*/
public HttpMultipartRequest(String urlStr, List<String[]> strParams, List<String[]> fileParams) {
this.urlStr = urlStr;
this.strParams = strParams;
this.fileParams = fileParams;
}
/**
* 向服務器發送post請求
* @return byte[]
* @throws Exception
*/
public byte[] sendPost() throws Exception {
//http鏈接器
HttpURLConnection hc = null;
//byte輸出流，用來讀取服務器返回的信息
ByteArrayOutputStream bos = null;
//輸入流，用來讀取服務器返回的信息
InputStream is = null;
//保存服務器返回的信息的byte數組
byte[] res = null;
try {
URL url = new URL(urlStr);
hc = (HttpURLConnection) url.openConnection();
hc.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
hc.setRequestProperty("Charsert", "UTF-8");
// 發送POST請求必須設置以下兩行
hc.setDoOutput(true);
hc.setDoInput(true);
hc.setUseCaches(false);
hc.setRequestMethod("POST");
OutputStream dout = hc.getOutputStream();
////1.先寫文字形式的post流
//頭
String boundary = BOUNDARY;
//中
StringBuffer resSB = new StringBuffer("/r/n");
//尾
String endBoundary = "/r/n--" + boundary + "--/r/n";
//strParams 1:key 2:value
if(strParams != null){
for(String[] parsm : strParams){
String key = parsm[0];
String value = parsm[1];
resSB.append("Content-Disposition: form-data; name=/"").append(key).append("/"/r/n").append("/r/n").append(
value).append("/r/n").append("--").append(boundary).append("/r/n");
}
}
String boundaryMessage = resSB.toString();
//寫出流
dout.write( ("--"+boundary+boundaryMessage).getBytes("utf-8") );
//2.再寫文件開式的post流
//fileParams 1:fileField, 2.fileName, 3.fileType, 4.filePath
resSB = new StringBuffer();
if(fileParams != null){
for(int i=0, num=fileParams.size(); i<num; i++){
String[] parsm = fileParams.get(i);
String fileField = parsm[0];
String fileName = parsm[1];
String fileType = parsm[2];
String filePath = parsm[3];
resSB.append("Content-Disposition: form-data; name=/"").append(fileField).append("/"; filename=/"").append(
fileName).append("/"/r/n").append("Content-Type: ").append(fileType).append("/r/n/r/n");
dout.write( resSB.toString().getBytes("utf-8") );
//開始寫文件
File file = new File(filePath);
DataInputStream in = new DataInputStream(new FileInputStream(file));
int bytes = 0;
byte[] bufferOut = new byte[1024 * 5];
while ((bytes = in.read(bufferOut)) != -1) {
dout.write(bufferOut, 0, bytes);
}
if(i<num-1){
dout.write( endBoundary.getBytes("utf-8") );
}
in.close();
}
}
//3.最後寫結尾
dout.write( endBoundary.getBytes("utf-8") );
dout.close();
int ch;
is = hc.getInputStream();
bos = new ByteArrayOutputStream();
while ((ch = is.read()) != -1) {
bos.write(ch);
}
res = bos.toByteArray();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (bos != null)
bos.close();
if (is != null)
is.close();
} catch (Exception e2) {
e2.printStackTrace();
}
}
return res;
}
}