Java解码网页表单post内容小记

对网页表单post提交的数据进行解码。一般编码是base64或application/x-www-form-urlencoded类型，本文主要是针对这个实现。当然有很多是js加密的，就只能看怎么破解js中的加密算法了。还有如ContentType文件类型是text/octet纯二进制文件的，不知如何解码。

一般解码代码如下，仅供参考。

public static void main(String[] args) throws Exception {
String line="ifacelog.iqiyi.com|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";
String[] strPosts=line.split("\\|");//获取行，并按照|分隔符提取
String domain=strPosts[0];//domian
String postdata=strPosts[1];//content
System.out.println(postdata);
String lastStr=postdata.substring(postdata.length()-1);//获取最后一位
if(lastStr.equals("=")){ //符合base64编码特征，用base64解码
byte[] bEncode=postdata.getBytes();//获取post串的字节
byte[] bDecode= it.sauronsoftware.base64.Base64.decode(bEncode);//用base64解码
postdata=new String(bDecode);
System.out.println(postdata);
}
if(postdata.contains("%") || postdata.contains("+")){
//原串和经过base64解码后的串中合application/x-www-form-urlencoded类型
//支持text/plain类型
String charSet="UTF-8";//默认
try{//获取域名，返回服务器编码方式ContentType
URL u = new URL("http://"+domain);
URLConnection uc = u.openConnection();
String type = uc.getContentType();
if(type!=null) {
int i=type.indexOf("=");
if(i!=-1) charSet=type.substring(i+1, type.length());
}
System.out.println(charSet);
String content=URLDecoder.decode(postdata,charSet);
System.out.println(content);
}catch(IOException e){e.printStackTrace();}
}
}

执行后结果：
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
vv=0%092016-07-26+00%3A04%3A00%09352746066674252%09GPhone%094.4.2%091920*1080%09SM-N900%091%091189880031%0969842642483add0a63503306d63f0443%097.3%09513140900%0913%091%0910%09%090%090%091%091%092153%091%0972748%0916%090%091%09200%090%09113.07443%2C22.868384%09200%09513140900%090%0911%09%09a4344abe6e56a9280beb0ed5ab574e76%09e77b8799274352cf%09%091%090%091%0974217%090%091%09613A01E6636F51765CC7C8A63937F5FC%09%26upderid%3D%09%090%09%09%09%09qy_home%2CR%3A204835112%3A6%2C100%2C+%2C1%09%09%090%090%090%090%09-1%09%7B%22rtype%22%3A%221%22%2C%22pop%22%3A%221%22%2C%22pos%22%3A%220%22%7D%09%09vb7rnha1ck5kzotd%090%09cn_s
utf-8
vv=0 2016-07-26 00:04:00 352746066674252 GPhone 4.4.2 1920*1080 SM-N900 1 1189880031 69842642483add0a63503306d63f0443 7.3 513140900 13 1 10 0 0 1 1 2153 1 72748 16 0 1 200 0 113.07443,22.868384 200 513140900 0 11 a4344abe6e56a9280beb0ed5ab574e76 e77b8799274352cf 1 0 1 74217 0 1 613A01E6636F51765CC7C8A63937F5FC &upderid= 0 qy_home,R:204835112:6,100, ,1 0 0 0 0 -1 {"rtype":"1","pop":"1","pos":"0"} vb7rnha1ck5kzotd 0 cn_s