Android入门:封装一个HTTP请求的辅助类

类名:HttpRequestUtil

提供了如下功能:

(1)模拟GET请求;

(2)模拟POST请求;

(3)模拟文件上传请求;

(4)发送XML数据;

发送GET请求

(1)public static URLConnection sendGetRequest(String url, Map

**FormFile.java**

package com.xiazdong.netword.http.util;  

import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileNotFoundException;  
import java.io.InputStream;  

/** * 上传文件 */  
public class FormFile {  
    /* 上传文件的数据 */  
    private byte[] data;  
    private InputStream inStream;  
    private File file;  
    /* 文件名称 */  
    private String filname;  
    /* 请求参数名称*/  
    private String parameterName;  
    /* 内容类型 */  
    private String contentType = "application/octet-stream";  

    /** * 此函数用来传输小文件 * @param filname * @param data * @param parameterName * @param contentType */  
    public FormFile(String filname, byte[] data, String parameterName, String contentType) {  
        this.data = data;  
        this.filname = filname;  
        this.parameterName = parameterName;  
        if(contentType!=null) this.contentType = contentType;  
    }  
    /** * 此函数用来传输大文件 * @param filname * @param file * @param parameterName * @param contentType */  
    public FormFile(String filname, File file, String parameterName, String contentType) {  
        this.filname = filname;  
        this.parameterName = parameterName;  
        this.file = file;  
        try {  
            this.inStream = new FileInputStream(file);  
        } catch (FileNotFoundException e) {  
            e.printStackTrace();  
        }  
        if(contentType!=null) this.contentType = contentType;  
    }  

    public File getFile() {  
        return file;  
    }  

    public InputStream getInStream() {  
        return inStream;  
    }  

    public byte[] getData() {  
        return data;  
    }  

    public String getFilname() {  
        return filname;  
    }  

    public void setFilname(String filname) {  
        this.filname = filname;  
    }  

    public String getParameterName() {  
        return parameterName;  
    }  

    public void setParameterName(String parameterName) {  
        this.parameterName = parameterName;  
    }  

    public String getContentType() {  
        return contentType;  
    }  

    public void setContentType(String contentType) {  
        this.contentType = contentType;  
    }  

}  

HttpRequestUtil.java

package com.xiazdong.netword.http.util;  
import java.io.BufferedReader;  
import java.io.ByteArrayOutputStream;  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileNotFoundException;  
import java.io.InputStream;  
import java.io.InputStreamReader;  
import java.io.OutputStream;  
import java.net.HttpURLConnection;  
import java.net.InetAddress;  
import java.net.Socket;  
import java.net.URL;  
import java.net.URLConnection;  
import java.net.URLEncoder;  
import java.util.HashMap;  
import java.util.Map;  
import java.util.Map.Entry;  
import java.util.Set;  

/* * 此类用来发送HTTP请求 * */  
public class HttpRequestUtil {  
    /** * 发送GET请求 * @param url * @param params * @param headers * @return * @throws Exception */  
    public static URLConnection sendGetRequest(String url,  
            Map<String, String> params, Map<String, String> headers)  
            throws Exception {  
        StringBuilder buf = new StringBuilder(url);  
        Set<Entry<String, String>> entrys = null;  
        // 如果是GET请求,则请求参数在URL中 
        if (params != null && !params.isEmpty()) {  
            buf.append("?");  
            entrys = params.entrySet();  
            for (Map.Entry<String, String> entry : entrys) {  
                buf.append(entry.getKey()).append("=")  
                        .append(URLEncoder.encode(entry.getValue(), "UTF-8"))  
                        .append("&");  
            }  
            buf.deleteCharAt(buf.length() - 1);  
        }  
        URL url1 = new URL(buf.toString());  
        HttpURLConnection conn = (HttpURLConnection) url1.openConnection();  
        conn.setRequestMethod("GET");  
        // 设置请求头 
        if (headers != null && !headers.isEmpty()) {  
            entrys = headers.entrySet();  
            for (Map.Entry<String, String> entry : entrys) {  
                conn.setRequestProperty(entry.getKey(), entry.getValue());  
            }  
        }  
        conn.getResponseCode();  
        return conn;  
    }  
    /** * 发送POST请求 * @param url * @param params * @param headers * @return * @throws Exception */  
    public static URLConnection sendPostRequest(String url,  
            Map<String, String> params, Map<String, String> headers)  
            throws Exception {  
        StringBuilder buf = new StringBuilder();  
        Set<Entry<String, String>> entrys = null;  
        // 如果存在参数,则放在HTTP请求体,形如name=aaa&age=10 
        if (params != null && !params.isEmpty()) {  
            entrys = params.entrySet();  
            for (Map.Entry<String, String> entry : entrys) {  
                buf.append(entry.getKey()).append("=")  
                        .append(URLEncoder.encode(entry.getValue(), "UTF-8"))  
                        .append("&");  
            }  
            buf.deleteCharAt(buf.length() - 1);  
        }  
        URL url1 = new URL(url);  
        HttpURLConnection conn = (HttpURLConnection) url1.openConnection();  
        conn.setRequestMethod("POST");  
        conn.setDoOutput(true);  
        OutputStream out = conn.getOutputStream();  
        out.write(buf.toString().getBytes("UTF-8"));  
        if (headers != null && !headers.isEmpty()) {  
            entrys = headers.entrySet();  
            for (Map.Entry<String, String> entry : entrys) {  
                conn.setRequestProperty(entry.getKey(), entry.getValue());  
            }  
        }  
        conn.getResponseCode(); // 为了发送成功 
        return conn;  
    }  
    /** * 直接通过HTTP协议提交数据到服务器,实现如下面表单提交功能: * <FORM METHOD=POST ACTION="http://192.168.0.200:8080/ssi/fileload/test.do" enctype="multipart/form-data"> <INPUT TYPE="text" NAME="name"> <INPUT TYPE="text" NAME="id"> <input type="file" name="imagefile"/> <input type="file" name="zip"/> </FORM> * @param path 上传路径(注:避免使用localhost或127.0.0.1这样的路径测试,因为它会指向手机模拟器,你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试) * @param params 请求参数 key为参数名,value为参数值 * @param file 上传文件 */  
    public static boolean uploadFiles(String path, Map<String, String> params, FormFile[] files) throws Exception{       
        final String BOUNDARY = "---------------------------7da2137580612"; //数据分隔线 
        final String endline = "--" + BOUNDARY + "--\r\n";//数据结束标志 

        int fileDataLength = 0;  
        if(files!=null&&files.length!=0){  
            for(FormFile uploadFile : files){//得到文件类型数据的总长度 
                StringBuilder fileExplain = new StringBuilder();  
                fileExplain.append("--");  
                fileExplain.append(BOUNDARY);  
                fileExplain.append("\r\n");  
                fileExplain.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");  
                fileExplain.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");  
                fileExplain.append("\r\n");  
                fileDataLength += fileExplain.length();  
                if(uploadFile.getInStream()!=null){  
                    fileDataLength += uploadFile.getFile().length();  
                }else{  
                    fileDataLength += uploadFile.getData().length;  
                }  
            }  
        }  
        StringBuilder textEntity = new StringBuilder();  
        if(params!=null&&!params.isEmpty()){  
            for (Map.Entry<String, String> entry : params.entrySet()) {//构造文本类型参数的实体数据 
                textEntity.append("--");  
                textEntity.append(BOUNDARY);  
                textEntity.append("\r\n");  
                textEntity.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"\r\n\r\n");  
                textEntity.append(entry.getValue());  
                textEntity.append("\r\n");  
            }  
        }  
        //计算传输给服务器的实体数据总长度 
        int dataLength = textEntity.toString().getBytes().length + fileDataLength +  endline.getBytes().length;  

        URL url = new URL(path);  
        int port = url.getPort()==-1 ? 80 : url.getPort();  
        Socket socket = new Socket(InetAddress.getByName(url.getHost()), port);          
        OutputStream outStream = socket.getOutputStream();  
        //下面完成HTTP请求头的发送 
        String requestmethod = "POST "+ url.getPath()+" HTTP/1.1\r\n";  
        outStream.write(requestmethod.getBytes());  
        String accept = "Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n";  
        outStream.write(accept.getBytes());  
        String language = "Accept-Language: zh-CN\r\n";  
        outStream.write(language.getBytes());  
        String contenttype = "Content-Type: multipart/form-data; boundary="+ BOUNDARY+ "\r\n";  
        outStream.write(contenttype.getBytes());  
        String contentlength = "Content-Length: "+ dataLength + "\r\n";  
        outStream.write(contentlength.getBytes());  
        String alive = "Connection: Keep-Alive\r\n";  
        outStream.write(alive.getBytes());  
        String host = "Host: "+ url.getHost() +":"+ port +"\r\n";  
        outStream.write(host.getBytes());  
        //写完HTTP请求头后根据HTTP协议再写一个回车换行 
        outStream.write("\r\n".getBytes());  
        //把所有文本类型的实体数据发送出来 
        outStream.write(textEntity.toString().getBytes());           
        //把所有文件类型的实体数据发送出来 
        if(files!=null&&files.length!=0){  
            for(FormFile uploadFile : files){  
                StringBuilder fileEntity = new StringBuilder();  
                fileEntity.append("--");  
                fileEntity.append(BOUNDARY);  
                fileEntity.append("\r\n");  
                fileEntity.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");  
                fileEntity.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");  
                outStream.write(fileEntity.toString().getBytes());  
                if(uploadFile.getInStream()!=null){  
                    byte[] buffer = new byte[1024];  
                    int len = 0;  
                    while((len = uploadFile.getInStream().read(buffer, 0, 1024))!=-1){  
                        outStream.write(buffer, 0, len);  
                    }  
                    uploadFile.getInStream().close();  
                }else{  
                    outStream.write(uploadFile.getData(), 0, uploadFile.getData().length);  
                }  
                outStream.write("\r\n".getBytes());  
            }  
        }  
        //下面发送数据结束标志,表示数据已经结束 
        outStream.write(endline.getBytes());  
        BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));  
        if(reader.readLine().indexOf("200")==-1){//读取web服务器返回的数据,判断请求码是否为200,如果不是200,代表请求失败 
            return false;  
        }  
        outStream.flush();  
        outStream.close();  
        reader.close();  
        socket.close();  
        return true;  
    }  
    /** * 提交数据到服务器 * @param path 上传路径(注:避免使用localhost或127.0.0.1这样的路径测试,因为它会指向手机模拟器,你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试) * @param params 请求参数 key为参数名,value为参数值 * @param file 上传文件 */  
    public static boolean uploadFile(String path, Map<String, String> params, FormFile file) throws Exception{  
       return uploadFiles(path, params, new FormFile[]{file});  
    }  
    /** * 将输入流转为字节数组 * @param inStream * @return * @throws Exception */  
    public static byte[] read2Byte(InputStream inStream)throws Exception{  
        ByteArrayOutputStream outSteam = new ByteArrayOutputStream();  
        byte[] buffer = new byte[1024];  
        int len = 0;  
        while( (len = inStream.read(buffer)) !=-1 ){  
            outSteam.write(buffer, 0, len);  
        }  
        outSteam.close();  
        inStream.close();  
        return outSteam.toByteArray();  
    }  
    /** * 将输入流转为字符串 * @param inStream * @return * @throws Exception */  
    public static String read2String(InputStream inStream)throws Exception{  
        ByteArrayOutputStream outSteam = new ByteArrayOutputStream();  
        byte[] buffer = new byte[1024];  
        int len = 0;  
        while( (len = inStream.read(buffer)) !=-1 ){  
            outSteam.write(buffer, 0, len);  
        }  
        outSteam.close();  
        inStream.close();  
        return new String(outSteam.toByteArray(),"UTF-8");  
    }  
    /** * 发送xml数据 * @param path 请求地址 * @param xml xml数据 * @param encoding 编码 * @return * @throws Exception */  
    public static byte[] postXml(String path, String xml, String encoding) throws Exception{  
        byte[] data = xml.getBytes(encoding);  
        URL url = new URL(path);  
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();  
        conn.setRequestMethod("POST");  
        conn.setDoOutput(true);  
        conn.setRequestProperty("Content-Type", "text/xml; charset="+ encoding);  
        conn.setRequestProperty("Content-Length", String.valueOf(data.length));  
        conn.setConnectTimeout(5 * 1000);  
        OutputStream outStream = conn.getOutputStream();  
        outStream.write(data);  
        outStream.flush();  
        outStream.close();  
        if(conn.getResponseCode()==200){  
            return read2Byte(conn.getInputStream());  
        }  
        return null;  
    }  
    //测试函数 
    public static void main(String args[]) throws Exception {  
        Map<String, String> params = new HashMap<String, String>();  
        params.put("name", "xiazdong");  
        params.put("age", "10");  
        HttpURLConnection conn = (HttpURLConnection) HttpRequestUtil  
                .sendGetRequest(  
                        "http://192.168.0.103:8080/Server/PrintServlet",  
                        params, null);  
        int code = conn.getResponseCode();  
        InputStream in = conn.getInputStream();  
        byte[]data = read2Byte(in);  
    }  
}  

测试代码:

Map<String,String> params = new HashMap<String,String>();  
params.put("name", name.getText().toString());  
params.put("age", age.getText().toString());  
HttpURLConnection conn = (HttpURLConnection) HttpRequestUtil.sendGetRequest("http://192.168.0.103:8080/Server/PrintServlet", params, null);  

文件上传测试代码:

FormFile formFile = new FormFile(file.getName(), file, "document", "text/plain");  
boolean isSuccess = HttpRequestUtil.uploadFile("http://192.168.0.103:8080/Server/FileServlet", null, formFile);  

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