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java请求api的代码 java请求接口的几种方式

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java 调用windows api 如何实现public class TestJni {
public native void GetTickCount();
static {
System.loadLibrary("Kernel32.dll");
【java请求api的代码 java请求接口的几种方式】}
public static void main(String[] args) {
TestJni testJni = new TestJni();
testJni.GetTickCount();
}
}
执行上面代码结果是,用java调用windowsAPI
java.lang.UnsatisfiedLinkError: no Kernel32.dll in java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at com.TestJni. clinit(TestJni.java:7)
Exception in thread "main"
Java平台提供了一套自己的API 。这套API中的一些平台相关的东西，比如文件的读?。蚴荍ava虚拟机调用windows API来实现的 。所以你使用Java给你提供的API就足够了，而且还保证了可以跨平台运行 。
如果你非要像你说的那样做的话，就用Java中的native方法 。这样你就可以用C/C++来实现Java中声明的函数了 。
JAVA 调用系统API, 有的参数需要传地址,代码如下,希望懂的朋友能教教我jtf.setSize(20, 5);
jta = new JTextArea(5,20);
jta.setLineWrap(true);//自动换行
jsp = new JScrollPane(jta);//滚动面板
jb=new JButton("查询");
this.setContentPane(jp);
jp.add(jtf);
jp.add(jb);
jp.add(jsp);
jb.addMouseListener(new MyAction());
}
public void check()
{
try {
fr=new FileReader(file);
bfr=new BufferedReader(fr);
int i=0,k=0;
String str="";
while(i20)
{
str=bfr.readLine();
String[] emp=str.split(",");
if((jtf.getText()).equals(emp[1]))
{
jta.setText(str);
k++;
}
i++;
}
if(k1){
JOptionPane.showMessageDialog(EmpCheck.this, "未找到该员工信息！","错误",JOptionPane.ERROR_MESSAGE);
}
bfr.close();
fr.close();
}catch (FileNotFoundException a){
a.printStackTrace();
}catch (IOException a){
a.printStackTrace();
}
}
class MyAction implements MouseListener{
@Override
public void mouseClicked(MouseEvent e) {
check();
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
}
如何用Java调用别人API接口java发一个http请求过去 ， 带上参数就可以了?。颐窃阡榔魃戏梦首试词且谎?只是它返回的是json格式的数据而已
给你两个方法吧：
public static String do_post(String url, ListNameValuePair name_value_pair) throws IOException {
String body = "{}";
DefaultHttpClient httpclient = new DefaultHttpClient();
try {
HttpPost httpost = new HttpPost(url);
httpost.setEntity(new UrlEncodedFormEntity(name_value_pair, StandardCharsets.UTF_8));
HttpResponse response = httpclient.execute(httpost);
HttpEntity entity = response.getEntity();
body = EntityUtils.toString(entity);
} finally {
httpclient.getConnectionManager().shutdown();
}
return body;
}
public static String do_get(String url) throws ClientProtocolException, IOException {
String body = "{}";
DefaultHttpClient httpclient = new DefaultHttpClient();
try {
HttpGet httpget = new HttpGet(url);
HttpResponse response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();

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