我正在尝试使用 Spring MVC 3.1 和 REST API 开发示例应用程序。
在进入应用程序之前,有一个登录表单来验证用户。我想使用 REST API 使用用户在登录表单中提供的凭据(用户名和密码)进行基本身份验证。
我的问题是我不知道如何使用 REST API 进行基本身份验证。
我进行了很多搜索,但没有得到任何正确的教程,我可以从中解决我的错误。
请任何人指导我或告诉我任何好的文章?
现在我正在学习以下教程 http://www.jpalace.org/docs/technotes/spring/rest-security.html但得到空指针异常。
RestClient.java
import org.springframework.web.client.RestTemplate;
public class RestClient {
RestTemplate restTemplate = new RestTemplate();
static final String URL = "http://www.assembla.com/spaces/my_spaces";
static final String username = "aaaaa";
static final String password = "aaaaa";
public RestClient() {
BasicSecureSimpleClientHttpRequestFactory requestFactory = new BasicSecureSimpleClientHttpRequestFactory();
requestFactory.setCredentialsProvider(new SimpleCredentialsProvider(
new Credentials(username, password)));
restTemplate.setRequestFactory(requestFactory);
}
public void exec() {
System.out.println("restTemplate :::::::::::::::::: " + restTemplate);
String response = restTemplate.getForObject(URL, String.class);
System.out.println("Response:::::::::::::: " + response);
}
}
BasicSecureSimpleClientHttpRequestFactory.java
import java.net.HttpURLConnection;
import sun.misc.BASE64Encoder;
public class BasicSecureSimpleClientHttpRequestFactory extends
SecureSimpleClientHttpRequestFactory {
public BasicSecureSimpleClientHttpRequestFactory() {
}
protected void prepareSecureConnection(HttpURLConnection connection) {
if (credentialsProvider == null) {
return;
}
Credentials credentials = credentialsProvider.getCredentials(null);
String token = credentials.getUsername() + ":"
+ credentials.getPassword();
BASE64Encoder enc = new sun.misc.BASE64Encoder();
String encodedAuthorization = enc.encode(token.getBytes());
connection.setRequestProperty("Authorization", "Basic "
+ encodedAuthorization);
}
}
SecureSimpleClientHttpRequestFactory .java
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import org.springframework.http.HttpMethod;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
abstract public class SecureSimpleClientHttpRequestFactory extends
SimpleClientHttpRequestFactory {
protected CredentialsProvider credentialsProvider;
public SecureSimpleClientHttpRequestFactory() {
}
public CredentialsProvider getCredentialsProvider() {
return credentialsProvider;
}
public void setCredentialsProvider(CredentialsProvider credentialsProvider) {
this.credentialsProvider = credentialsProvider;
}
@Override
public ClientHttpRequest createRequest(URI uri, HttpMethod httpMethod)
throws IOException {
HttpURLConnection connection = openConnection(uri.toURL(), null);
prepareConnection(connection, httpMethod.name());
prepareSecureConnection(connection);
return new SecureSimpleClientHttpRequest(connection);
}
abstract protected void prepareSecureConnection(HttpURLConnection connection);
}
SecureSimpleClientHttpRequest .java
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URI;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.http.client.ClientHttpResponse;
public class SecureSimpleClientHttpRequest implements ClientHttpRequest {
public SecureSimpleClientHttpRequest(HttpURLConnection connection) {
// TODO Auto-generated constructor stub
}
@Override
public HttpMethod getMethod() {
// TODO Auto-generated method stub
return null;
}
@Override
public URI getURI() {
// TODO Auto-generated method stub
return null;
}
@Override
public HttpHeaders getHeaders() {
// TODO Auto-generated method stub
return null;
}
@Override
public OutputStream getBody() throws IOException {
// TODO Auto-generated method stub
return null;
}
@Override
public ClientHttpResponse execute() throws IOException {
// TODO Auto-generated method stub
return null;
}
}
SimpleCredentialsProvider .java
public class SimpleCredentialsProvider implements CredentialsProvider {
private Credentials credentials;
public SimpleCredentialsProvider(Credentials credentials) {
super();
this.credentials = credentials;
}
@Override
public Credentials getCredentials(String str) {
return credentials;
}
}
凭据提供程序.java
public interface CredentialsProvider {
public Credentials getCredentials(String str);
}
凭据.java
public class Credentials {
private String username;
private String password;
public Credentials(String username, String password) {
super();
this.username = username;
this.password = password;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
我收到以下错误:
2012 年 10 月 16 日下午 12:56:04 org.apache.catalina.core.StandardWrapperValve 调用严重:servlet spring 的 Servlet.service() 在 org.springframework.web.client.RestTemplate$AcceptHeaderRequestCallback 处抛出异常 java.lang.NullPointerException。 doWithRequest(RestTemplate.java:530) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:444) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:409) at org.springframework .web.client.RestTemplate.getForObject(RestTemplate.java:207)