Android 代码不';服务器响应请求时无法工作
最近我在学习服务器和android之间的请求和响应。 当服务器响应时,我尝试更新Android 代码不';服务器响应请求时无法工作,android,json,server,Android,Json,Server,最近我在学习服务器和android之间的请求和响应。 当服务器响应时,我尝试更新JSON文件,但失败了。更新代码不起作用 服务器代码是这样的:代码“JSONArray”不起作用,但我不知道为什么 public class AndroidServerServlet extends HttpServlet { private static final long serialVersionUID = 6792396567928634227L; public void doPost(
JSON
文件,但失败了。更新代码不起作用
服务器代码是这样的:代码“JSONArray”不起作用,但我不知道为什么
public class AndroidServerServlet extends HttpServlet {
private static final long serialVersionUID = 6792396567928634227L;
public void doPost(HttpServletRequest request,
HttpServletResponse response)throws ServletException, IOException {
response.setContentType("text/plain; charset=UTF-8");
request.setCharacterEncoding("UTF-8");
String username = request.getParameter("username");
String newPassword = request.getParameter("newpassword");
PrintWriter printWriter = response.getWriter();
printWriter.print("hello android, password changed");
printWriter.flush();
printWriter.close();
System.out.println(username+"\n"+newPassword);
ChangePassword(username , newPassword);
}
private void ChangePassword(String username , String password){
try {
InputStream in = AndroidServerServlet.class
.getClassLoader().getResourceAsStream("/1.json");
Scanner scanner = new Scanner(in, "UTF-8"); //InputStream → String
String jsonData = scanner.useDelimiter("\\A").next();
System.out.println(jsonData);
scanner.close();
JSONArray jsonArray = new JSONArray(jsonData);
for(int i = 0;i < jsonArray.length(); i++){
JSONObject object = jsonArray.getJSONObject(i);
if(username.equals(object.getString("username")))
object.put("password",password);
}
System.out.println(jsonData);
in.close();
}catch (Exception e){
System.out.print("Exception\n");
}
}
}
json文件如下所示:
[{"username":"test1","password":"password1"},
{"username":"test2","password":"password2"},
{"username":"test3","password":"password3"}]
当我调试服务器代码时,我发现了一个错误:java.long.NoClassDefFoundError:org/json/JSONArray。但是我已经在项目中添加了这个jar,为什么会出现错误
顺便说一句:我使用IntellijIDEA+MAVEN+Tomcat来构建我的服务器
错误报告:
java.lang.NoClassDefFoundError: org/json/JSONArray
at AndroidServerServlet.ChangePassword(AndroidServerServlet.java:41)
at AndroidServerServlet.doPost(AndroidServerServlet.java:31)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1437)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
我试图删除我添加的jar,但错误的报告仍然与top相同,证明我没有添加jar,但如何添加它?我可以建议使用HttpUrlConnection而不是ServletRequest/Response、Scanner等 请检查此链接:
您可以在发布内容部分找到一个示例。建议使用
改装/gson
,因为它的学习曲线足够小,使用起来会更轻松!您的web服务是否正常工作?实际上,您并没有向服务器发送正确的请求格式,您应该以json格式发送,而您是以请求参数格式发送。
java.lang.NoClassDefFoundError: org/json/JSONArray
at AndroidServerServlet.ChangePassword(AndroidServerServlet.java:41)
at AndroidServerServlet.doPost(AndroidServerServlet.java:31)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:789)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1437)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)