蛋包饭怎么做,龙腾海啸txt,点绛唇元好问
首先看一下别人写的非常全的：
https://www.cnblogs.com/tenwood/p/8563617.html
以及我用了后依然有乱码，解决参考：
https://www.cnblogs.com/cornucopia/p/4498177.html
历程如下：：：：
做商汤人脸识别系统，对方提供的示例为：
我要评论package com.sensetime.bi.senselink.open.api;
import javax.net.ssl.sslexception;
import java.io.*;
import java.net.httpurlconnection;
import java.net.url;
import java.security.messagedigest;
import java.security.nosuchalgorithmexception;
import java.util.hashmap;
import java.util.iterator;
import java.util.map;
public class apidemo {
//输入你的app_key
private final static string app_key = "586949450e231c71";
//输入你的app_secret
private final static string app_secret = "e27c8593b933fe892969877941d729dd";
//本机要上传的图片位置
private final static string path = "f://123.png";
//要使用的api的uri
private final static string uri = "/api/v1/recognition/check";
private final static string boundary = "----webkitformboundarygrbcuhvtenqcbtqn";
private static string name;
public static void main(string[] args) throws exception {
string url = "https://link.bi.sensetime.com" + uri;
//表单文本参数
map<string, object> params = new hashmap();
//表单文件参数
map<string, byte[]> fileparams = new hashmap();
file avatar_file = new file(path);
name = avatar_file.getname();
long timestamp = gettimestamp();
//添加表单文本参数
{
params.put("app_key", app_key);
params.put("timestamp", string.valueof(timestamp));
params.put("sign", getsign(string.valueof(timestamp)));
}
//添加表单文件参数
{
fileparams.put("face_avatar", getbytes(avatar_file));
}
string result = new string(dopost(url, params, fileparams));
system.out.println(result);
}
public static byte[] dopost(string strurl, map<string, object> params, map<string, byte[]> fileparams) throws exception {
url url = new url(strurl);
httpurlconnection connection = (httpurlconnection) url.openconnection();
connection.setdooutput(true);
connection.setdoinput(true);
connection.setusecaches(false);
connection.setinstancefollowredirects(true);
connection.setrequestmethod("post");
connection.setrequestproperty("accept", "application/json, text/plain, */*"); // 设置接收数据的格式
connection.setrequestproperty("content-type", "multipart/form-data; boundary=" + boundary); // 设置发送数据的格式
connection.connect();
dataoutputstream out = new dataoutputstream(connection.getoutputstream());
iterator it = params.entryset().iterator();
while (it.hasnext()) {
map.entry<string, string> entry = (map.entry) it.next();
string key = entry.getkey();
string value = entry.getvalue();
out.writebytes("--" + boundary + "\r\n");
out.writebytes("content-disposition: form-data; name=\"" + key + "\"");
out.writebytes("\r\n\r\n");
out.writebytes(value + "\r\n");
}
if (fileparams != null && fileparams.size() > 0) {
iterator fileit = fileparams.entryset().iterator();
while (fileit.hasnext()) {
map.entry<string, byte[]> fileentry = (map.entry<string, byte[]>) fileit.next();
out.writebytes("--" + boundary + "\r\n");
out.writebytes("content-disposition: form-data; name=\"" + fileentry.getkey()
+ "\"; filename=\"" + name + "\"");
out.writebytes("\r\n");
out.writebytes("content-type: image/jpeg");//此处很关键
out.writebytes("\r\n\r\n");
out.write(fileentry.getvalue());
out.writebytes("\r\n");
}
}
out.writebytes("--" + boundary + "--");
out.flush();
out.close();
inputstream in = null;
int code = connection.getresponsecode();
try {
if (code == 200) {
in = connection.getinputstream();
} else {
in = connection.geterrorstream();
}
} catch (sslexception e) {
e.printstacktrace();
return new byte[0];
}
bytearrayoutputstream baout = new bytearrayoutputstream();
byte[] buff = new byte[1024];
int len;
while ((len = in.read(buff)) != -1) {
baout.write(buff, 0, len);
}
byte[] bytes = baout.tobytearray();
in.close();
return bytes;
}
public static long gettimestamp() {
return system.currenttimemillis();
}
public static string getsign(string timestamp) {
string code = timestamp + "#" + app_secret;
return getmd5(code);
}
private static string getmd5(string sourcestr) {
string result = "";
try {
messagedigest md = messagedigest.getinstance("md5");
md.update(sourcestr.getbytes());
byte b[] = md.digest();
int i;
stringbuffer buf = new stringbuffer("");
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if (i < 0)
i += 256;
if (i < 16)
buf.append("0");
buf.append(integer.tohexstring(i));
}
result = buf.tostring();
} catch (nosuchalgorithmexception e) {
system.out.println(e);
}
return result;
}
public static byte[] getbytes(file f) {
try {
inputstream in = new fileinputstream(f);
bytearrayoutputstream out = new bytearrayoutputstream(1024);
byte[] b = new byte[1024];
int n;
while ((n = in.read(b)) != -1)
out.write(b, 0, n);
in.close();
out.close();
return out.tobytearray();
} catch (ioexception e) {
system.out.println("***请设置文件路径***");
}
return null;
}
}
用起来ok，但中文显示乱码。后来上网找方法，参照这条博文https://www.cnblogs.com/tenwood/p/8563617.html。将out.writebytes(content)替换为out.write(content.getbytes()) 。依然乱码。
又参照这条博文解决 https://www.cnblogs.com/cornucopia/p/4498177.html。心里历程如下：
/**
运行后结果对于中文传递过去后是乱码。
原因：
out.writebytes();这个方法点进去结构为：
public final void writebytes(string s) throws ioexception {
int len = s.length();
for (int i = 0 ; i < len ; i++) {
out.write((byte)s.charat(i));
}
inccount(len);
}
因为java里的char类型是16位的，一个char可以存储一个中文字符，在将其转换为 byte后高8位会丢失，这样就无法将中文字符完整的输出到输出流中。
所以在可能有中文字符输出的地方最好先将其转换为字节数组，然后再通过write写入流，
目前尝试过这种方法：把上面链接代码中的out.writebytes(content);替换为out.write(content.getbytes());先把数据转成byte在写入流，执行成功.
执行成功，但还是乱码，找了很久，后来把out.write(content.getbytes())改为out.write(content.getbytes("utf-8"))解决。
原因是：
在java中,string的getbytes()方法是得到一个操作系统默认的编码格式的字节数组。这表示在不同的操作系统下,返回的东西不一样!
把string转换成bytes，各种编码转换成的bytes不同，比如utf-8每个汉字转成3bytes，而gbk转成2bytes，所以要说明编码方式，否则用缺省编码。
（另外：与getbytes相对的,可以通过new string(byte[], decode)的方式来还原）
**/
最终代码：
public static string dopost(string strurl, map<string, object> params, map<string, byte[]> fileparams,string filename) throws exception {
logger.info("*******dopost1()参数为：\n strurl："+strurl +"\n params:"+params +" \n fileparams:"+fileparams+" \n filename:"+filename);
string ret = null;
url url = null;
inputstream in = null;
string two_hyphens = "--";
string line_end = "\r\n";
try {
url = new url(strurl);
httpurlconnection connection = (httpurlconnection) url.openconnection();//得到connection对象
/************************************设置请求头*************************************************/
connection.setrequestmethod("post"); //设置请求方式为post
connection.setdooutput(true); //允许写出
connection.setdoinput(true); //允许读入
connection.setusecaches(false); //不使用缓存
connection.setinstancefollowredirects(true);//本次连接是否自动处理重定向(true:系统自动处理重定向；false:则需要自己从http reply中分析新的url)(置所有的http连接是否自动处理重定向:public static void httpurlconnection.setfollowredirects(boolean followredirects))
connection.setrequestproperty("charset", "utf-8");//编码格式
connection.setrequestproperty("content-type", "multipart/form-data ; boundary=" + boundary); // 设置发送数据的格式(form-data格式) //boundary为头部分隔符，头部拼接时需要分隔符。例如下面的有多个"content-disposition"拼接时需要用到此分隔符
connection.setrequestproperty("accept", "application/json, text/plain, */*"); // 设置接收数据的格式(json格式)
connection.connect(); //连接
/************************************输出流，写数据,start*************************************************/
dataoutputstream out = new dataoutputstream(connection.getoutputstream());//获得输出流对象
stringbuffer strbufparam = new stringbuffer();
iterator it = params.entryset().iterator();
while (it.hasnext()) {
//封装键值对数据
map.entry<string, string> entry = (map.entry) it.next();
string key = entry.getkey();
string value = entry.getvalue();
strbufparam.append(two_hyphens);
strbufparam.append(boundary);
strbufparam.append(line_end);//"--" + boundary + "\r\n"
strbufparam.append("content-disposition: form-data; name=\"" + key + "\"");
strbufparam.append(line_end);
strbufparam.append(line_end);
strbufparam.append(value);
strbufparam.append(line_end);
}
out.write(strbufparam.tostring().getbytes("utf-8"));
strbufparam.tostring().getbytes();
//写入图片参数
if (fileparams != null && fileparams.size() > 0) {
iterator fileit = fileparams.entryset().iterator();
while (fileit.hasnext()) {
map.entry<string, byte[]> fileentry = (map.entry<string, byte []>) fileit.next();
//拼接文件的参数
stringbuffer strbuffile = new stringbuffer();
strbuffile.append(two_hyphens);
strbuffile.append(boundary);
strbuffile.append(line_end);
//strbuffile.append("content-disposition: form-data; name=\"" + "image" + "\"; filename=\"" + file.getname() + "\"");
strbuffile.append("content-disposition: form-data; name=\"" + fileentry.getkey() + "\"; filename=\"" + filename + "\"");// fileentry.getkey()：文件全路径。filename：文件名称
strbuffile.append(line_end);
strbuffile.append("content-type: image/jpeg");//此处很关键----文件格式
strbuffile.append(line_end);
strbuffile.append(line_end);
out.write(strbuffile.tostring().getbytes());
out.write(fileentry.getvalue());//文件 (此参数之前调用了本页面的重写方法getbytes(file f)，将文件转换为字节数组了 )
out.write((line_end).getbytes());
}
}
//写入标记结束位
byte[] enddata = ( two_hyphens + boundary + two_hyphens + line_end).getbytes();//写结束标记位
out.write(enddata);
out.flush();
out.close();
/*
下面是商汤提供的示例方法。
dataoutputstream out = new dataoutputstream(connection.getoutputstream());//获得输出流对象
iterator it = params.entryset().iterator();
while (it.hasnext()) {
//写入键值对数据一
map.entry<string, string> entry = (map.entry) it.next();
string key = entry.getkey();
string value = entry.getvalue();
out.writebytes("--" + boundary + "\r\n");
out.writebytes("content-disposition: form-data; name=\"" + key + "\"");
out.writebytes("\r\n\r\n");
out.writebytes(value + "\r\n");
}
//写入图片参数
if (fileparams != null && fileparams.size() > 0) {
iterator fileit = fileparams.entryset().iterator();
while (fileit.hasnext()) {
map.entry<string, byte[]> fileentry = (map.entry<string, byte[]>) fileit.next();
out.writebytes("--" + boundary + "\r\n");
out.writebytes("content-disposition: form-data; name=\"" + fileentry.getkey() + "\"; filename=\"" + filename + "\"");// fileentry.getkey()：文件全路径。filename：文件名称
out.writebytes("\r\n");
out.writebytes("content-type: image/jpeg");//此处很关键----文件格式
out.writebytes("\r\n\r\n");
out.write(fileentry.getvalue());//文件
out.writebytes("\r\n");
}
}
out.writebytes("--" + boundary + "--");
out.flush();
out.close();
*/
/************************************输出流，写数据完成end*************************************************/
int code = connection.getresponsecode(); //获得响应码（200为成功返回）
try {
if (code == httpurlconnection.http_ok) {
in = connection.getinputstream(); //获取响应流
} else {
in = connection.geterrorstream(); //获取响应流
}
} catch (sslexception e) {
e.printstacktrace();
return "";
}
/**********读取返回的输入流信息**************/
byte[] bytes = null;
bytearrayoutputstream baout = new bytearrayoutputstream();
byte[] buff = new byte[1024];
int len;
while ((len = in.read(buff)) != -1) {
baout.write(buff, 0, len);
}
bytes = baout.tobytearray();
in.close();
ret = new string(bytes) ;
}catch(exception e){
logger.error("向商汤服务器发送指令时出错dopost():"+e.getmessage());
e.printstacktrace();
}
return ret;
}
/**
* 将文件转换为byte数组
* @param f
* @return
*/
public static byte[] getbytes(file f) {
try {
inputstream in = new fileinputstream(f);
bytearrayoutputstream out = new bytearrayoutputstream(1024);
byte[] b = new byte[1024];
int n;
while ((n = in.read(b)) != -1)
out.write(b, 0, n);
in.close();
out.close();
return out.tobytearray();
} catch (ioexception e) {
logger.error("***请设置文件路径***");
e.printstacktrace();
}
return null;
}
在 https://www.cnblogs.com/tenwood/p/8563617.html博文下面，作者说封装了方法，放到github上了，有时间可以去看看。
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