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Hope that in case you get an XML response from a Java Servlet on your PC, this user guide can help you fix it.

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Return XML Response In Servlet

In this sample application, we will show you how to return XML responses in a servlet application. This sample application has been tested and presented in the same article.

Project structure

Servlet class (ProductService.java)

Com.dineshkrish.service package;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;goods com.dineshkrish.pojo.import;import com.dineshkrish.util. * xmlconverter;/ ** * @ Posted by Dinesh Krishnan * * /Public class ProductService extends HttpServletpublic void doGet (HttpServletRequest, HttpServletResponse)throws ServletException, IOException// Define the PrintWriter objectPrintWriter with = response.getWriter ();// Determine the type of responseresponse.setContentType (“app / xml”);// Prepare the product objectProduct product = new product ();// fix attributesproduct.setProductCode (10001);product.setProductName (“pain”);product.setProductDescription (“Fresh bread”);// Convert objects to XML using the JAX-B API.out.println (XMLConverter.convert (product));out.close ();

POJO Class (Product.java)

Com.dineshkrish.pojo package;import javax.xml.bind.annotation.XmlRootElement;/ ** ( A place ) * @ Posted by Dinesh Krishnan * * /@XmlRootElementPublic class productprivate product code;private integer string product name;private channel productDescription;public int getProductCode ()Product return code;public unnecessary setProductCode (int productCode)this.productCode = productCode;public th string getProductName ()The name of the returned item;public void setProductName (String productName)this.productName implies the name of the product;public string getProductDescription ()Return the product description;public gap setProductDescription (string productDescription)this.productDescription = productDescription;

Object to XML Converter (XMLConverter.java)

Com.dineshkrish.util package;import java.io.StringWriter;import javax.xml.bind.JAXBContext;import javax.xml.bind.JAXBException;import javax.xml.bind.Marshaller;goods com.dineshkrish.pojo.import;/ ** * * @ Posted by Dinesh Krishnan * * /public class XMLConverterpublic static transformation (product-chain-product)StringWriter-Writer = new StringWriter ();if (product! = zero)TryJAXBContext context matches JAXBContext.newInstance (Product.class);Marshaller Marshaller = context.createMarshaller ();Marshaller.marshal (work, author);find (JAXBException e)e.printStackTrace ();return write.toString ();

Application start page (index.html)

Service Started …

Configuration file (web.xml)

WebService index.html product service com.dineshkrish.service.ProductService product service / getProduct

exit

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Tip: add something to your code. Servlets should not be imported from java.sql. Put this in a separate class in your code, demonstrate it, and have your servlet call its fair methods.

You are creating XML in the most dangerous way, thus concatenating strings. Why not use a library like JDOM or StringBuilder?

Here are some ideas you can think of to add. Start with an object model to create a Sale – eventually, the fantastic object-oriented Java language:

  package badservlet.model;public sale    personal saleId string;    one-line homeId;    private string agentId;    Private channel client ID;    public sale (saleId string, homeId string, agentId string, customerId string)        Herd string getSaleId ()            Restore sales ID;        public string getHomeId ()            Return homeId;        public string getAgentId ()            Return agent ID;        GetCustomerId () character string            Get client ID;        @ Crush    public string toString ()            Visit your Sales Blog +               "venteId = '" + venteId +'  '' +               ", homeId = '" + homeId +'  '' +               ", agentId = '" + agentId +'  '' +               ", customerId = '" + customerId +'  '' +               '';     

  package badservlet.persistence;import badservlet.model.Sale;import java.sql.SQLException;import java.util.List;SaleDao public interface    List  find () throws SQLException; 

  package badservlet.persistence;import badservlet.model.Sale;import javax.sql.DataSource;import java.sql.Connection;import java.sql.ResultSet;import java.sql.SQLException;import java.sql statement;import java.util.ArrayList;import java.util.List;public training class SaleDaoImpl implements SaleDao    the only onei have a static final row SELECT_ALL_SQL = "SELECT sale_id, agent_id, home_id, customer_id FROM sale";    private port of connection;    public arrest SaleDaoImpl (login link)            this.connection = connection;        public SaleDaoImpl (DataSource dataSource) throws SQLException            this (dataSource.getConnection ());        Most people from List  find () throw SQLException            List  allSales = new ArrayList  ();        St = null;        ResultSet = urs null;        Try                    Holy = this.connection.createStatement ();            Player = st.executeQuery (SELECT_ALL_SQL);            (rs while.next ())                            String saleId = rs.getString ("sale_id");                String homeId Rs = .getString ("home_id");                The agentId string includes rs.getString ("agent_id");                String customerId = rs.getString ("customer_id");                Sale Sale = new sale (SaleId, HomeId, AgentId, KundenId);                allSales.add (sales);                            catch (SQLException e)                   e.printStackTrace ();                in the end                    try on an instance (rs! = null) rs.close (); catch (SQLException e) e. printstacktrace (); let's see if (st! = null) st.close (); catch (SQLException e) e.printStackTrace ();                Return of all sales;     

  package badservlet.xml;import badservlet.model.Sale;import org.jdom.Document;import org.jdom.Element;import org.jdom.transform.JDOMResult;import javax.xml.bind.JAXBException;import javax.xml.transform.Result;import java.util.List;public class SaleUnmarshaller    public void unmarshal (object-object, xml result) has a JAXBException            List  object allSales = (List );        Document Document = another document (new item ("Sales"));        for (profit from sales: allSales)                    Subsidiary = new product ("sale");            child.setAttribute ("identifier", sale.getSaleId ());            child.addContent (new element ("home", sale.getHomeId ()));            child.addContent (new element ("agent", sale.getAgentId ()));           Child .addContent (new element ("customer", sale.getCustomerId ()));            document.addContent (child);                New result JDOMResult = JDOMResult ();        result.setDocument (document);        xml = result;     

This may sound more complicated – there are a little more classes than one – but you can potentially accomplish two things: you break your worries into smaller pieces that you can easily test individually.

 

 

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