Android环境是wampserver+eclipse，在网上找了个demo，想实现初步的注册和登录功能.但是测试的时候报了Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject，卡住了。求解...
logcat打印的信息：
11-17 15:40:04.666: D/Log_Debug(14690): this json<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">
11-17 15:40:04.666: D/Log_Debug(14690): <HTML><HEAD><TITLE>Bad Request</TITLE>
11-17 15:40:04.666: D/Log_Debug(14690): <META HTTP-EQUIV="Content-Type" Content="text/html; charset=us-ascii"></HEAD>
11-17 15:40:04.666: D/Log_Debug(14690): <BODY><h2>Bad Request - Invalid Header</h2>
11-17 15:40:04.666: D/Log_Debug(14690): <hr><p>HTTP Error 400. The request has an invalid header name.</p>
11-17 15:40:04.666: D/Log_Debug(14690): </BODY></HTML>
11-17 15:40:04.669: E/JSON Parser(14690): Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
11-17 15:40:04.671: W/System.err(14690): java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.json.JSONObject.getString(java.lang.String)' on a null object reference
JSONParser.java
package com.example.travelguide;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is=null;
static JSONObject jObj=null;
static String json="";
//constructor
public JSONParser()
{}
public JSONObject makeHttpRequest(String url,String method,List<NameValuePair> params)
{
try{
// check for request method
if(method.equals("POST")){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
//httpPost.setEntity(new UrlEncodedFormEntity(params));
//httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));//设置编码
StringEntity se;
se = new StringEntity(json.toString());
httpPost.setEntity(se);
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
//Log.e("Log_tag", "POST url is "+url.toString());
}else if(method.equals("GET")){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "gb2312");
url += "?"+ paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
//Log.e("Log_tag", " GET url is"+url.toString());
}
else
{
Log.e("Log_tag", "Params Error");
}
} catch(UnsupportedEncodingException e) {
e.printStackTrace();
} catch(ClientProtocolException e) {
e.printStackTrace();
} catch(IOException e) {
e.printStackTrace();
}
try{
//BufferedReader reader = new BufferedReader(new InputStreamReader(
// is, "iso-8859-1"), 8);
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "UTF-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while((line = reader.readLine()) != null) {
sb.append(line + "\n");
// Log.d("log_tag", "line is :"+line+sb.toString());
}
is.close();
json = sb.toString();
// Log.e("Log_tag", "this json is "+json.toString());
} catch(Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
Log.d("json", json.toString());//李霜新加的
}
// try parse the string to a JSON object
try{
jObj = new JSONObject(json);
} catch(JSONException e) {
Log.d("Log_Debug", "this json"+json.toString());
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
return jObj;
}
}
/*static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);// 建立HttpPost对象
httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));// 设置编码
// 发送Post,并返回一个HttpResponse对象
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();// Creates a new InputStream object of
// the entity.
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "UTF-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
Log.d("json", json.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}*/
唉我去，第一次提问没经验，重新贴代码
JSONParser.java
package com.example.travelguide;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is=null;
static JSONObject jObj=null;
static String json="";
//constructor
public JSONParser()
{}
public JSONObject makeHttpRequest(String url,String method,List<NameValuePair> params)
{
try{
// check for request method
if(method.equals("POST")){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
//httpPost.setEntity(new UrlEncodedFormEntity(params));
//httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));//设置编码
StringEntity se;
se = new StringEntity(json.toString());
httpPost.setEntity(se);
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
//Log.e("Log_tag", "POST url is "+url.toString());
}else if(method.equals("GET")){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "gb2312");
url += "?"+ paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
//Log.e("Log_tag", " GET url is"+url.toString());
}
else
{
Log.e("Log_tag", "Params Error");
}
} catch(UnsupportedEncodingException e) {
e.printStackTrace();
} catch(ClientProtocolException e) {
e.printStackTrace();
} catch(IOException e) {
e.printStackTrace();
}
try{
//BufferedReader reader = new BufferedReader(new InputStreamReader(
// is, "iso-8859-1"), 8);
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "UTF-8"));
StringBuilder sb = new StringBuilder();
String line = null;
while((line = reader.readLine()) != null) {
sb.append(line + "\n");
// Log.d("log_tag", "line is :"+line+sb.toString());
}
is.close();
json = sb.toString();
// Log.e("Log_tag", "this json is "+json.toString());
} catch(Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
Log.d("json", json.toString());
}
// try parse the string to a JSON object
try{
jObj = new JSONObject(json);
} catch(JSONException e) {
Log.d("Log_Debug", "this json"+json.toString());
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
return jObj;
}
}
registerAcyivity.java
package com.example.travelguide;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.StrictMode;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class registerActivity extends Activity {
private EditText name, password, passText2, telText;
private Button okBtn, resetBtn, cancelBtn;
//private TextView nameView, passView1, passView2, telView;
private int success;
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
private static String url = "http://192.168.139.1/register.php";
private static final String TAG_MESSAGE = "message";
private static final String TAG_SUCCESS = "success";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.register);
okBtn = (Button) findViewById(R.id.okBtn);
resetBtn = (Button) findViewById(R.id.resetBtn);
cancelBtn = (Button) findViewById(R.id.cancelBtn);
name = (EditText) findViewById(R.id.regnameText);
password = (EditText) findViewById(R.id.passText1);
passText2 = (EditText) findViewById(R.id.passText2);
telText = (EditText) findViewById(R.id.telText);
// nameView = (TextView) findViewById(R.id.regName);
// passView1 = (TextView) findViewById(R.id.regPass1);
// passView2 = (TextView) findViewById(R.id.regPass2);
// telView = (TextView) findViewById(R.id.regTel);
okBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// new
// TODO Auto-generated method stub
if (name.getText().toString().length() == 0) {
new AlertDialog.Builder(registerActivity.this)
.setTitle("错误！").setMessage("请输入姓名！")
.setPositiveButton("确定", null).show();
name.requestFocus();
password.setText("");
passText2.setText("");
} else if (password.getText().toString().length() == 0) {
new AlertDialog.Builder(registerActivity.this)
.setTitle("错误！").setMessage("请输入新密码！")
.setPositiveButton("确定", null).show();
password.requestFocus();
} else if (passText2.getText().toString().length() == 0) {
new AlertDialog.Builder(registerActivity.this)
.setTitle("错误！").setMessage("请确认密码！")
.setPositiveButton("确定", null).show();
passText2.requestFocus();
}
// else if(telText.getText().toString().length()==0){
// new
// AlertDialog.Builder(registerActivity.this).setTitle("错误！")
// .setMessage("请输入手机号！").setPositiveButton("确定", null).show();
// telText.requestFocus();
// }
else if (!password.getText().toString()
.equals(passText2.getText().toString())) {
new AlertDialog.Builder(registerActivity.this)
.setTitle("错误！").setMessage("两次密码输入不一致！")
.setPositiveButton("确定", null).show();
password.setText("");
passText2.setText("");
password.requestFocus();
} else {
new Up().execute();
//name.requestFocus();
}
}
});
resetBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
name.setText("");
password.setText("");
passText2.setText("");
telText.setText("");
name.requestFocus();
}
});
cancelBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
}
class Up extends AsyncTask<String, String, String> {
// 这里是最终用户调用Excute时的接口，当任务执行之前开始调用此方法，在这里显示进度对话框
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(registerActivity.this);
pDialog.setMessage("正在提交..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
// 后台执行
protected String doInBackground(String... args) {
String name1 = name.getText().toString();
String password1 = password.getText().toString();
String tel = telText.getText().toString();
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("name", name1));// 添加参数
params.add(new BasicNameValuePair("password", password1));
params.add(new BasicNameValuePair("tel", tel));
try {
JSONObject json = jsonParser.makeHttpRequest(url, "POST",params);
String message =json.getString(TAG_MESSAGE);
success=json.getInt(TAG_SUCCESS);
//返回结果传递给onPostExecute();
return message;
//return "oops";
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
/*
* 相当于Handler 处理UI的方式，在这里面可以使用在doInBackground 得到的结果处理操作UI。
* 此方法在主线程执行，任务执行的结果作为此方法的参数返回
* 完成后台任务，当后台计算结束后调用。后台计算的结果会被作为参数传递给这一函数。
*/
protected void onPostExecute(String message) {
if(success==1){
finish();
}
if(success==0){
String c="success is "+success;
password.setText("");
passText2.setText("");
telText.setText("");
name.requestFocus();
}
pDialog.dismiss();
// message 为接收doInbackground的返回值
Toast.makeText(getApplicationContext(), message, 8000).show();
}
}
public static final String removeBOM(String json) {
if (json!=null && json.startsWith("\ufeff")) {
return json.substring(1);
} else {
return json;
}
}
}
register.php
<?php
/*
* Created on 2015-4-24
*
* To change the template for this generated file go to
* Window - Preferences - PHPeclipse - PHP - Code Templates
*/
// array for JSON response
//var_dump(json_decode($json));
$response = array();
include("conn.php");
$json = file_get_contents ( 'php://input' );
$obj = json_decode ( $json );
var_dump(json_decode($json));
if (isset($_POST['name']) && isset($_POST['password']) ) {
$name = $_POST['name'];
$password = $_POST['password'];
$tel=$_POST['tel'];
$sql="SELECT * FROM user WHERE name='$name'";
$res=mysql_query($sql);
$row = mysql_fetch_array($res, MYSQL_ASSOC);
if(!mysql_num_rows($res))
{
$result = mysql_query("INSERT INTO user(name,password,tel) VALUES('$name', MD5('$password'),'$tel')");
if ($result) {
// successfully inserted into database
$response["success"] = 1;
$response["message"] = urlencode('用户创建成功!');
// echoing JSON response
echo urldecode(json_encode($response));
} else {
// failed to insert row
$response["success"] = 0;
$response["message"] = urlencode('创建失败!');
// echoing JSON response
echo urldeode(json_encode($response));
}
}
else{
// failed to register
$response["success"] = 0;
$response["message"] = urlencode('用户已经存在!');
// echoing JSON response
echo urldecode(json_encode($response));
}
}
else {
// required field is missing
$response["success"] = 0;
$response["message"] = urlencode('请求失败!');
// echoing JSON response
echo urldecode(json_encode($response));
}
?>