运行应用程序时出现网络错误

Question

如何解决此错误？我的代码是Android servlet method，当我运行此代码时，出现此错误。谢谢您的帮助。

 I/hwaps: JNI_OnLoad
    W/Settings: mValues not put! needsGenerationTracker: true currentGeneration: -1 name: enable_navbar value: null
    V/AudioManager: playSoundEffect   effectType: 0
    W/System.err: android.os.NetworkOnMainThreadException
    W/System.err:     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1460)
    W/System.err:     at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:356)
    W/System.err:     at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:201)
    W/System.err:     at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:183)
    W/System.err:     at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356)
    W/System.err:     at java.net.Socket.connect(Socket.java:616)
    W/System.err:     at java.net.Socket.connect(Socket.java:565)
    W/System.err:     at java.net.Socket.<init>(Socket.java:445)
    W/System.err:     at java.net.Socket.<init>(Socket.java:248)
    W/System.err:     at com.example.user.myapplication.MainActivity.sendmessage(MainActivity.java:46)
    W/System.err:     at com.example.user.myapplication.MainActivity.access$000(MainActivity.java:15)
    W/System.err:     at com.example.user.myapplication.MainActivity$1.onClick(MainActivity.java:31)
    W/System.err:     at android.view.View.performClick(View.java:6291)
    W/System.err:     at android.view.View$PerformClick.run(View.java:24931)
    W/System.err:     at android.os.Handler.handleCallback(Handler.java:808)
    W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:101)
    W/System.err:     at android.os.Looper.loop(Looper.java:166)
    W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7425)
    W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
    W/System.err:     at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
    W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:921)
    D/HwRTBlurUtils: check blur style for HwToast-Toast, themeResId : 0x0103013f, context : android.app.Application@a14e1f2, Nhwext : 6, get Blur : disable with , android.graphics.drawable.NinePatchDrawable@ae82043
    D/OpenGLRenderer:   HWUI Binary is  enabled
    W/ViewRootImpl[Toast]: EGLdebug relayoutWindow Surface isSurface(name=null)  (appName =com.example.user.myapplication) ( mSurfaceControllerIsValid =false) (mNativeObject  =0)/@0x914136d,viewVisibility is0
    W/ViewRootImpl[Toast]: EGLdebug relayoutWindow Surface isSurface(name=null)  (appName =com.example.user.myapplication) ( mSurfaceControllerIsValid =true) (mNativeObject  =7bd036e000)/@0x914136d,relayoutResult is7
    W/ViewRootImpl[Toast]: EGLdebug Surface isSurface(name=null)  (appName =com.example.user.myapplication) ( mSurfaceControllerIsValid =true) (mNativeObject  =7bd036e000)/@0x914136d
    D/mali_winsys: EGLint new_window_surface(egl_winsys_display *, void *, EGLSurface, EGLConfig, egl_winsys_surface **, egl_color_buffer_format *, EGLBoolean) returns 0x3000
    D/OpenGLRenderer:   HWUI Binary is  enabled
    I/zygote64: Do partial code cache collection, code=29KB, data=24KB
    I/zygote64: After code cache collection, code=29KB, data=24KB
    I/zygote64: Increasing code cache capacity to 128KB