AsyncHttpClient框架对数据提交的案例
AsyncHttpClient实际上是对HttpClient框架的进一步封装，可在www.github.com下载压缩好的框架文件。
下载下来之后，可将src里面的java源文件直接放入我们的项目或者在releases目录下使用最新的jar包
public void click(View view){
//用户名密码提交到服务器
AsyncHttpClient client = new AsyncHttpClient();
String path = "http://192.168.1.110:8080/web/LoginServlet?username="
+ URLEncoder.encode("飞牛")
+ "&password="
+ URLEncoder.encode("321");
client.get(path, new AsyncHttpResponseHandler(){
public void onSuccess(String content){
super.onSuccess(content);
Toast.makeText(MainActivity.this, "请求成功" + content, 0).show();
}
public void onFailure(Throwable error, String content){
super.onFailure(error, content);
Toast.makeText(MainActivity.this, "请求失败" + content, 0).show();
}
});
}
实现的原理：
自定义一个类AsyncHttpClient：
public class AsyncHttpClient{
public void get(final String path, final MyHandler myHandler){
new Thread(){
public void run(){
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(path);
try{
HttpResponse response = client.execute(httpGet);
InputStream is = response.getEntity().getContent();
String content = StreamTools.readInputStream(is);
//执行成功
Message msg = new Message();
msg.what = 1;
msg.obj = content;
myHandler.sendMessage(msg);
}catch(Exception e){
//执行失败
e.printStackTrace();
Message msg = new Message();
msg.what = 2;
msg.obj = "请求失败";
myHandler.sendMessage(msg);
}
};
}.start();
}
}
自定义一个MyHandler类：
public class MyHandler extends Handler{
public void onFailure(String content){
}
public void onSuccess(String content){
}
public void handleMessage(Message msg){
String content = (String) msg.obj;
switch(msg.what){
case 1:
onSuccess(content);
break;
case 2:
onFailure(content);
break;
}
super.handleMessage(msg);
}
}
点击事件中：
public void click(View view){
//1. 开启子线程 执行一个http请求在后台执行 在子线程中执行
//2. 子线程执行完毕后通知UI界面更新
AsyncHttpClient client = new AsyncHttpClient();
String path = "http://192.168.1.110:8080/web/LoginServlet?username="
+ URLEncoder.encode("飞牛")
+ "&password="
+ URLEncoder.encode("321");
client.get(path, new MyHandler(){
public void onFailure(String content){
Toast.makeText(MainActivity.this, content, 1).show();
super.onFailure(content);
}
public void onSuccess(String content){
Toast.makeText(MainActivity.this, content, 1).show();
super.onSuccess(content);
}
});
}
框架的POST请求方式：
public void click(View view){
final String username = et_username.getText().toString().trim();
final String password = et_password.getText().toString().trim();
AsyncHttpClient client = new AsyncHttpClient();
String url = "http://192.168.1.110/web/LoginServlet";
RequestParams params = new RequestParams();
params.put("username", username);
params.put("password", password);
client.post(url, params, new AsyncHttpResponseHandler(){
public void onSuccess(String content){
super.onSuccess(content);
Toast.makeText(MainActivity.this, content, 0).show();
}
});
}
上传文件到服务器：
服务端导入commons-fileupload.jar与commons-io.jar两个包:
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException,
IOException {
boolean isMultipart =ServletFileUpload.isMultipartContent(request);
if(isMultipart){
String realpath = request.getSession().getServletContext().getRealPath("/files");
System.out.println(realpath);
File dir = new File(realpath);
if(!dir.exists()){
dir.mkdirs();
}
FileItemFactory factory =new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setHeaderEncoding("UTF-8");
try{
List<FileItem> items = upload.parseRequest(request);
for(FileItem item : items){
if(item.isFormField()){
String name1 = item.getFieldName();//得到请求参数的名称
String value = item.getString("UTF-8");//得到参数值
System.out.println(name1+"="+value);
}else{
item.write(new File(dir, System.currentTimeMillis()
+ item.getName().substring(
item.getName().lastIndexOf("."))));
}
}
}catch(Exception e){
e.printStackTrace();
}
}else{
doGet(request, response);
}
}
Jsp文件：
<form actin="UploadFileServlet" method="post" enctype="multipart/form-data">
文件：<input name="filename" type="file"><br>
<input name="submit" type="submit" value="上传">
</form>
客户端
xml文件：
<EditText
android:id="@+id/et_path"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入文件的路径"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="click"
android:text="上传"/>
MainActivity文件：
public void click(View view){
String path = et_path.getText().toString().trim();
File file = new File(path);
if(file.exists() && file.length > 0){
AsyncHttpClient client = new AsyncHttpClient();
RequestParams params = new RequestParams();
try{
params.put("profile_picture", file);
}catch(FileNotFoundException e){
e.printStackTrace();
}
client.post("http://192.168.1.110:8080/web/UploadFileServlet",
params, new AsyncHttpResponseHandler(){
public void onSuccess(String content){
Toast.makeText(MainActivity.this, "上传成功", 1).show();
super.onSuccess(content);
}
public void onFailure(Throwable error, String content){
Toast.makeText(MainActivity.this, "上传失败", 1).show();
super.onFailure(error, content);
}
});
}else{
}
}
