Servlet容器、Spring容器、SpringMVC容器之间的关系

之前在极客时间上回答老师的问题:

Servlet容器,是用于管理Servlet生命周期的。
Spring容器,是用于管理Spring Bean生命周期的。
SpringMVC容器,适用于管理SpringMVC Bean生命周期的。

Tomcat/Jetty启动,对于每个WebApp,依次进行初始化工作:
1、对每个WebApp,都有一个WebApp ClassLoader,和一个ServletContext
2、ServletContext启动时,会扫描web.xml配置文件,找到Filter、Listener和Servlet配置

3、如果Listener中配有Spring的ContextLoaderListener
3.1、ContextLoaderListener就会收到webapp的各种状态信息。
3.3、在ServletContext初始化时,ContextLoaderListener也就会将Spring IOC容器进行初始化,管理Spring相关的Bean。
3.4、ContextLoaderListener会将Spring IOC容器存放到ServletContext中

4、如果Servlet中配有SpringMVC的DispatcherServlet
4.1、DispatcherServlet初始化时(其一次请求到达)。
4.2、其中,DispatcherServlet会初始化自己的SpringMVC容器,用来管理Spring MVC相关的Bean。
4.3、SpringMVC容器可以通过ServletContext获取Spring容器,并将Spring容器设置为自己的根容器。而子容器可以访问父容器,从而在Controller里可以访问Service对象,但是在Service里不可以访问Controller对象。
4.2、初始化完毕后,DispatcherServlet开始处理MVC中的请求映射关系。

ibatis调用了错误的mapping

昨天,公司一位同事遇到了十分神奇的一件事情,就是ibaits在应该调用A类A1方法时,ibatis会调用到B类的B1方法。

几个人查了半天,没发现情况。

最后细心的小江同学发现,是有一个接口文件的声明,与映射文件中的参数类型不一致造成的。

好坑啊。。。

HBase简单通讯代码

首先,就要说一下配置问题了。HBase客户端的配置有两种方式,一种是通过配置文件,另一种是通过代码设置。

1、配置文件方式
配置文件名称为hbase-site.xml,该文件必须放置到CLASS_PATH下面才会有效,文件示例如下:
hbase-site.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
	<property>
		<name>hbase.rootdir</name>
		<value>hdfs://hadoop-master:9000/hbase</value>
	</property>
	<property>
		<name>hbase.cluster.distributed</name>
		<value>true</value>
	</property>
	<property>
		<name>hbase.master</name>
		<value>hdfs://hadoop-master:60000</value>
	</property>
	<property>
		<name>hbase.zookeeper.quorum</name>
		<value>hadoop-master,hadoop-slave01,hadoop-slave02</value>
	</property>
</configuration>

2、通过代码配置方式

        Configuration hbaseConfig = HBaseConfiguration.create();
        hbaseConfig.setInt("timeout", 120000);
        hbaseConfig.set("hbase.master", "hdfs://hadoop-master:60000");
        hbaseConfig.set("hbase.zookeeper.quorum", "hadoop-master,hadoop-slave01,hadoop-slave02");
        hbaseConfig.setInt("hbase.zookeeper.property.clientPort", 2181);
        hbaseConfig.setInt("hbase.client.retries.number", 1);

Continue reading HBase简单通讯代码

eXistDB简单通讯12(HTTP_SOAP)

  • 保存文件
  • 取回文件
  • 查询

1、QueryFileSOAP.java

package com.neohope.existdb.test;

import org.exist.soap.Query;
import org.exist.soap.QueryResponse;
import org.exist.soap.QueryService;
import org.exist.soap.QueryServiceLocator;

import java.net.URL;
import java.nio.charset.Charset;

public class QueryFileSOAP {
    public static void QueryXML(String xquery, String user, String pwd) throws Exception {
        QueryService service = new QueryServiceLocator();
        Query query = service.getQuery(new URL("http://localhost:8080/exist/services/Query"));
        String sessionId = query.connect("neotest", "neotest");

        byte[] queryData = xquery.getBytes(Charset.forName("UTF-8"));
        QueryResponse resp = query.xquery( sessionId, queryData );
        System.out.println( "found: " + resp.getHits() );
        if(resp.getHits() == 0) {
            return;
        }
        else {
            //get 10 results
            byte[][] hits = query.retrieveData(sessionId, 1, 10,
                    true, false, "elements").getElements();
            for (int i = 0; i < hits.length; i++) {
                System.out.println(new String(hits[i], "UTF-8"));
            }
        }

        query.disconnect(sessionId);
    }

    public static void main(String args[]) throws Exception {
        String user = "neotest";
        String pwd = "neotest";
        String query ="for $name in collection('/db/CDA')/ClinicalDocument/recordTarget/patientRole/patient/name \n" +
                "return \n" +
                "<name>{$name}</name> ";
        QueryXML(query, user, pwd);
    }
}

eXistDB简单通讯11(HTTP_SOAP)

  • 保存文件
  • 取回文件
  • 查询

1、GetFileSOAP.java

package com.neohope.existdb.test;

import org.exist.soap.Query;
import org.exist.soap.QueryService;
import org.exist.soap.QueryServiceLocator;

import java.net.URL;


public class GetFileSOAP {
    public static void GetXML(String fileId, String user, String pwd) throws Exception {
        QueryService service = new QueryServiceLocator();
        Query query = service.getQuery(new URL("http://localhost:8080/exist/services/Query"));
        String session = query.connect(user, pwd);

        byte[] data = query.getResourceData(session,
                "/db/CDA/"+fileId,
                true, false, false);
        System.out.println(new String(data, "UTF-8"));
        query.disconnect(session);
    }

    public static void main(String args[]) throws Exception {
        String user = "neotest";
        String pwd = "neotest";
        GetXML("入院患者护理评估单01.xml",user,pwd);
    }
}

eXistDB简单通讯10(HTTP_SOAP)

  • 保存文件
  • 取回文件
  • 查询

1、SaveFileSOAP.java

package com.neohope.existdb.test;

import org.exist.soap.*;

import java.io.BufferedReader;
import java.io.FileReader;
import java.net.URL;
import java.nio.charset.Charset;

public class SaveFileSOAP {
    public static void SaveXML(String xmlFilePath, String user, String pwd) throws Exception {
        AdminService adminService = new AdminServiceLocator();
        Admin admin = adminService.getAdmin(new URL("http://localhost:8080/exist/services/Admin"));
        String session = admin.connect("neotest", "neotest");

        BufferedReader f = new BufferedReader(new FileReader(xmlFilePath));
        String line;
        StringBuffer xml = new StringBuffer();
        while ((line = f.readLine()) != null)
            xml.append(line);
        f.close();

        admin.store(session, xml.toString().getBytes(Charset.forName("UTF-8")), "UTF-8", "/db/CDA/入院患者护理评估单02.xml", true);
        admin.disconnect(session);
    }

    public static void main( String[] args ) throws Exception {
        String user = "neotest";
        String pwd = "neotest";
        SaveXML("PATH_TO_FILE\\入院患者护理评估单02.xml", user, pwd);
    }
}

eXistDB简单通讯09(HTTP_REST)

  • 保存文件
  • 取回文件
  • 查询

1、QueryFileHTTP.java

package com.neohope.existdb.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.Charset;

public class QueryFileHTTP {
    public static void QueryXML(String query) throws IOException {
        URL url = new URL("http://localhost:8080/exist/rest/db/CDA");
        HttpURLConnection connect = (HttpURLConnection) url.openConnection();
        connect.setRequestProperty("Content-Type", "application/xml");
        connect.setRequestMethod("POST");
        connect.setDoOutput(true);

        OutputStream os = connect.getOutputStream();
        os.write(query.getBytes(Charset.forName("UTF-8")));
        connect.connect();

        BufferedReader is = new BufferedReader(new InputStreamReader(connect.getInputStream()));
        String line;
        while((line = is.readLine()) != null)
            System.out.println(line);
    }

    public static void main(String[] args) throws IOException {
        String query ="<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
                "<query xmlns=\"http://exist.sourceforge.net/NS/exist\" start=\"1\" max=\"10\" cache=\"no\">\n";
        query +="<text><![CDATA[\n" +
                "for $name01 in /ClinicalDocument/recordTarget/patientRole/patient/name \n" +
                "return \n" +
                "<name>{$name01}</name> \n" +
                "]]></text> \n";
        query +="<properties> \n";
        query +="<property name=\"indent\" value=\"yes\"/> \n";
        query +="<property name=\"encoding\" value=\"UTF-8\"/> \n";
        query +="</properties> \n";
        query +="</query>";
        System.out.println(query);
        QueryXML(query);
    }
}

eXistDB简单通讯08(HTTP_REST)

  • 保存文件
  • 取回文件
  • 查询

1、GetFileHTTP.java

package com.neohope.existdb.test;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;


public class GetFileHTTP {
    public static void GetXML(String fileId) throws IOException {
        URL url = new URL("http://localhost:8080/exist/rest/db/CDA/" + fileId);
        System.out.println("GET file from " + url.toString());

        HttpURLConnection connect = (HttpURLConnection) url.openConnection();
        connect.setRequestMethod("GET");
        connect.connect();
        System.out.println("Result:");

        BufferedReader bis = new BufferedReader(new InputStreamReader(connect.getInputStream()));
        String line;
        while ((line = bis.readLine()) != null) {
            System.out.println(line);
        }
    }

    public static void main(String[] args) throws IOException {
        GetXML("入院患者护理评估单01.xml");
    }
}

eXistDB简单通讯07(HTTP_REST)

  • 保存文件
  • 取回文件
  • 查询

1、SaveFileHTTP.java

package com.neohope.existdb.test;

//apache的base64会多一个换行符
//import org.apache.ws.commons.util.Base64;
//import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
import com.sun.xml.internal.messaging.saaj.util.Base64;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class SaveFileHTTP {
    public static void SaveXML(String inFileName, String fileId) throws IOException {
        URL url = new URL("http://localhost:8080/exist/rest/db/CDA/" + fileId);
        System.out.println("Save file to " + url.toString());

        HttpURLConnection connect = (HttpURLConnection) url.openConnection();
        connect.setRequestMethod("PUT");
        connect.setDoOutput(true);
        connect.setRequestProperty("Content-Type", "application/xml");
        String userCredentials = "neotest:neotest";
        String basicAuth = "Basic " + new String(new Base64().encode(userCredentials.getBytes()));
        System.out.println(basicAuth);
        connect.setRequestProperty ("Authorization", basicAuth);

        File file = new File(inFileName);
        InputStream is = new FileInputStream(file);
        OutputStream os = connect.getOutputStream();

        byte[] buf = new byte[1024];
        int c;
        while ((c = is.read(buf)) > -1) {
            os.write(buf, 0, c);
        }
        os.flush();
        os.close();
        System.out.println("Statuscode " + connect.getResponseCode()
                + " (" + connect.getResponseMessage() + ")");
    }

    public static void main(String[] args) throws IOException {
        SaveXML("D:\\MyProjects\\IDEA14\\TestExistDB\\XMLFiles\\医惠\\入院患者护理评估单01.xml", "入院患者护理评估单01.xml");
    }
}

eXistDB简单通讯06(RPC)

  • 保存文件
  • 取回文件

1、GetFileRPC.java

package com.neohope.existdb.test;

import org.apache.xmlrpc.XmlRpcException;
import org.apache.xmlrpc.client.XmlRpcClient;
import org.apache.xmlrpc.client.XmlRpcClientConfigImpl;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Vector;

public class GetFileRPC {
    public static void GetXML(String documentId, String user, String pwd) throws Exception {
        String uri = "http://localhost:8080/exist/xmlrpc";
        XmlRpcClient client = new XmlRpcClient();
        XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();
        config.setServerURL(new URL(uri));
        config.setBasicUserName(user);
        config.setBasicPassword(pwd);
        client.setConfig(config);

        HashMap<String, String> options = new HashMap<String, String>();
        options.put("indent", "yes");
        options.put("encoding", "UTF-8");
        options.put("expand-xincludes", "yes");
        options.put("process-xsl-pi", "no");

        Vector<Object> params = new Vector<Object>();
        params.addElement(documentId);
        params.addElement(options);
        String xml = (String)
                client.execute("getDocumentAsString", params);
        System.out.println(xml);
    }

    public static void GetXMLChuncked(String documentId, String outPath, String user, String pwd) throws IOException, XmlRpcException {
        String url = "http://localhost:8080/exist/xmlrpc";

        XmlRpcClient client = new XmlRpcClient();
        XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();
        config.setServerURL(new URL(url));
        config.setBasicUserName(user);
        config.setBasicPassword(pwd);
        client.setConfig(config);

        Hashtable<String, String> options = new Hashtable<String, String>();
        options.put("indent", "no");
        options.put("encoding", "UTF-8");

        Vector<Object> params = new Vector<Object>();
        params.addElement(documentId);
        params.addElement(options);

        FileOutputStream fos = new FileOutputStream(outPath);
        HashMap<?, ?> ht = (HashMap<?, ?>) client.execute("getDocumentData", params);
        int offset = ((Integer) ht.get("offset")).intValue();
        byte[] data = (byte[]) ht.get("data");
        String handle = (String) ht.get("handle");
        fos.write(data);

        while (offset != 0) {
            params.clear();
            params.addElement(handle);
            params.addElement(new Integer(offset));

            ht = (HashMap<?, ?>) client.execute("getNextChunk", params);
            data = (byte[]) ht.get("data");
            offset = ((Integer) ht.get("offset")).intValue();
            fos.write(data);
        }
        fos.close();
    }

    public static void main(String args[]) throws Exception {
        String user = "neotest";
        String pwd = "neotest";
        //GetXML("/db/CDA/入院患者护理评估单05.xml", user, pwd);
        GetXMLChuncked("/db/PNG/兔子.png","兔子1.png", user, pwd);
    }
}