由于最近涉及到的项目需要在与后台通信时，需要加解密，而后台发出来得Json是通过Encode加密了的，所以在接受后，需要在ios中用stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding方法来解密成UTF8。当然同样的，我需要发送请求给后台时，用stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding来加密。

iOS：接受--->解密---->加密:

- (void)reloadData

{

NSURL *url = [NSURL URLWithString:@"http://cqzjt.com:8081/testapp/servlet/Appinfo"];

NSString *post=@"postData";

NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

[request setHTTPMethod:@"POST"];

[request setHTTPBody:postData];

[request setTimeoutInterval:10.0];

NSOperationQueue *queue = [[NSOperationQueue alloc]init];

[NSURLConnection sendAsynchronousRequest:request

queue:queue

completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){

if (error) {

NSLog(@"Httperror:%@%d", error.localizedDescription,error.code);

}else{

NSInteger responseCode = [(NSHTTPURLResponse *)response statusCode];

NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

NSLog(@"HttpResponseCode:%d", responseCode);

NSLog(@"接受加密数据 %@",responseString);

NSString *decodeUrl = [responseString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSLog(@"解密数据:%@",decodeUrl);

NSString *encodeUrl = [decodeUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSLog(@"加密数据:%@",encodeUrl);

}

}];

}

输出结果：

JAVA:加密-->解密:

public void setEncodeResult(String encodeResult)

{

char[] src = encodeResult.toCharArray();//将待编码字串拆分成字符数组

StringBuilder sb = new StringBuilder();//保存编码后字符

//将待编码字串拆分成字符数组

for(int i = 0; i< src.length; i++)

{

if(Character.isDigit(src[i]))

{

if(i != src.length-1)

{//满足条件3

char[] temp = new char[Character.getNumericValue(src[i])+1];

Arrays.fill(temp,src[i+1]);

sb.append(temp);

sb.append("_");

}

else

{//满足条件2

sb.append(src[i]);

}

}

else if(src[i] == '_')//满足条件5

{

sb.append("\\UL");

sb.append("_");

}

else if(i == src.length-1)//满足条件1，且到了字串结尾

{

sb.append(src[i]);

}

else//满足条件1，且未到字串结尾

{

sb.append(src[i]);

sb.append("_");

}

}

this.encodeResult = new String(sb);//创建返回编码后字串

}

//获得编码后结果

public String getEncodeResult()

{

return encodeResult;

}

//解码设置

public void setDecodeResult(String encodeResult)

{

String[] temp = encodeResult.split("_");

StringBuilder sb = new StringBuilder();

for(int i = 0; i< temp.length; i++)

{

if(temp[i].equals("\\UL"))

sb.append("_");

else if(temp[i].length()>1)

sb.append(temp[i].length()-1);

else

sb.append(temp[i]);

}

this.decodeResult = new String(sb);

}

//获得解码后结果

public String getDecodeResult()

{

return decodeResult;

}

public static void main(String[] args)

{

System.out.println("请输入待编码字符串（以回车键结束）：");

String source = "";

try

{

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

source = br.readLine();

}

catch (IOException e)

{

e.printStackTrace();

}

Encode e = new Encode();

e.setEncodeResult(source);

System.out.println("编码后结果："+e.getEncodeResult());

e.setDecodeResult(e.getEncodeResult());

System.out.println("解码后结果："+e.getDecodeResult());

}

}