1. Get请求
public static void get(String argUrl, Map params, Map headers) {
try {
String urlFromParams = createUrlFromParams(argUrl, params);
URL url = new URL(urlFromParams);
//得到connection对象。
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
//设置请求方式
connection.setRequestMethod("GET");
if(headers != null){
for (Map.Entry entry : headers.entrySet()) {
connection.setRequestProperty(entry.getKey(), entry.getValue());
}
}
//连接
connection.connect();
//得到响应码
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
StringBuilder sb = new StringBuilder();
//得到响应流
InputStream is = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"));
String line = "";
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
is.close();
connection.disconnect();
}
} catch (Exception e) {
e.printStackTrace();
}
}
拼接参数
/**
* 将传递进来的参数拼接成 url
**/
public static String createUrlFromParams(String url, Map params) {
try {
StringBuilder sb = new StringBuilder();
sb.append(url);
if (url.indexOf('&') > 0 || url.indexOf('?') > 0) sb.append("&");
else sb.append("?");
for (Map.Entry urlParams : params.entrySet()) {
String value = urlParams.getValue();
//对参数进行 utf-8 编码,防止头信息传中文
String urlValue = URLEncoder.encode(value, "UTF-8");
sb.append(urlParams.getKey()).append("=").append(value).append("&");
}
sb.deleteCharAt(sb.length() - 1);
return sb.toString();
} catch (UnsupportedEncodingException e) {
}
return url;
}
2.Post请求
public static void post(String argUrl, String postData, Map headers) {
try {
URL url = new URL(argUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setUseCaches(false);
connection.connect();
if(headers != null){
for (Map.Entry entry : headers.entrySet()) {
connection.setRequestProperty(entry.getKey(), entry.getValue());
}
}
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(connection.getOutputStream(), "UTF-8"));
writer.write(postData);
writer.close();
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
StringBuilder sb = new StringBuilder();
//得到响应流
InputStream is = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"));
String line = "";
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
is.close();
connection.disconnect();
}
} catch (Exception e) {
e.printStackTrace();
}
}
3.上传文件
public void uploadFile(String argUrl,File file){
try {
URL url = new URL(argUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setUseCaches(false);
connection.setRequestProperty("Content-Type", "file/*");//设置数据类型
connection.connect();
OutputStream outputStream = connection.getOutputStream();
FileInputStream fileInputStream = new FileInputStream(file);//把文件封装成一个流
int length = -1;
byte[] bytes = new byte[1024];
while ((length = fileInputStream.read(bytes)) != -1){
outputStream.write(bytes,0,length);//写的具体操作
}
fileInputStream.close();
outputStream.close();
int responseCode = connection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
StringBuilder sb = new StringBuilder();
//得到响应流
InputStream is = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"));
String line = "";
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
is.close();
connection.disconnect();
}
} catch (Exception e) {
e.printStackTrace();
}
}
上传文件（带参数）
public void upload(String argUrl,Map params,File file){
try{
String BOUNDARY = java.util.UUID.randomUUID().toString();
String TWO_HYPHENS = "--";
String LINE_END = "\r\n";
URL url = new URL(argUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setUseCaches(false);
//设置请求头
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("Charset", "UTF-8");
connection.setRequestProperty("Content-Type","multipart/form-data; BOUNDARY=" + BOUNDARY);
connection.connect();
DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
StringBuffer strBufparam = new StringBuffer();
if(params != null){
for (Map.Entry entry : params.entrySet()) {
//封装键值对数据一
strBufparam.append(TWO_HYPHENS);
strBufparam.append(BOUNDARY);
strBufparam.append(LINE_END);
strBufparam.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"");
strBufparam.append(LINE_END);
strBufparam.append("Content-Type: " + "text/plain" );
strBufparam.append(LINE_END);
strBufparam.append("Content-Lenght: "+ entry.getValue().length());
strBufparam.append(LINE_END);
strBufparam.append(LINE_END);
strBufparam.append(entry.getValue());
strBufparam.append(LINE_END);
outputStream.write(strBufparam.toString().getBytes());
}
}
//拼接文件的参数
StringBuffer strBufFile = new StringBuffer();
strBufFile.append(LINE_END);
strBufFile.append(TWO_HYPHENS);
strBufFile.append(BOUNDARY);
strBufFile.append(LINE_END);
strBufFile.append("Content-Disposition: form-data; name=\"" + "file" + "\"; filename=\"" + file.getName() + "\"");
strBufFile.append(LINE_END);
strBufFile.append("Content-Type: " + "file/*" );
strBufFile.append(LINE_END);
strBufFile.append("Content-Lenght: "+file.length());
strBufFile.append(LINE_END);
strBufFile.append(LINE_END);
outputStream.write(strBufFile.toString().getBytes());
//写入文件
FileInputStream fileInputStream = new FileInputStream(file);
byte[] buffer = new byte[1024*2];
int length = -1;
while ((length = fileInputStream.read(buffer)) != -1){
outputStream.write(buffer,0,length);
}
outputStream.flush();
fileInputStream.close();
//写入标记结束位
byte[] endData = (LINE_END + TWO_HYPHENS + BOUNDARY + TWO_HYPHENS + LINE_END).getBytes();//写结束标记位
outputStream.write(endData);
outputStream.flush();
//得到响应
int responseCode = connection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
StringBuilder sb = new StringBuilder();
//得到响应流
InputStream is = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"));
String line = "";
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
}
is.close();
connection.disconnect();
}
}catch (IOException e){
}
}
4.下载文件
public static void download(String argUrl, String fileDir,String fileName) {
try {
URL url = new URL(argUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.connect();
int responseCode = connection.getResponseCode();
if(responseCode == HttpURLConnection.HTTP_OK){
InputStream inputStream = connection.getInputStream();
File dir = new File(fileDir);
if (!dir.exists()){
dir.mkdirs();
}
File file = new File(dir, fileName);//根据目录和文件名得到file对象
FileOutputStream fos = new FileOutputStream(file);
byte[] buf = new byte[1024*8];
int len = -1;
while ((len = inputStream.read(buf)) != -1){
fos.write(buf, 0, len);
}
fos.flush();
connection.disconnect();
}
} catch (Exception e) {
e.printStackTrace();
}
}