无法解析包含特殊字符的值？使用sax解析器

我是解析字段的新手.我正在尝试编写解析器代码但无法获取值包含的特定标记的值ampersand(&).请帮我解决问题.

我的xml文件看起来像

10145
1800015
B & P Infotech Ltd.

我尝试过这个java代码,但它没有给我正确的输出.

主要班级

package com.satya.xmltest;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

public class SaxTest {

    public static void main(String[] args) {
        SAXParserFactory parserFactory = SAXParserFactory.newInstance();
        SaxtestHandler handler=new SaxtestHandler();
        try {
            SAXParser parser = parserFactory.newSAXParser();
            parser.parse("C:\\Users\\abc\\Desktop\\test.xml", handler);
        } catch (Exception e) {
        }
        SystemTo systemTo=handler.systemTo;
        System.out.println("Uid :"+systemTo.getUid());
        System.out.println("serial number :"+systemTo.getSerialNumber());
        System.out.println("name :"+systemTo.getName());
    }
}

处理程序类

在此类中,完成解析并将数据值设置为数据容器类.

package com.satya.xmltest;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class SaxtestHandler extends DefaultHandler {
    String content = "";
    SystemTo systemTo=new SystemTo();

    @Override
    public void startElement(String uri, String localName, String qName,
        Attributes attributes) throws SAXException {

        switch (qName) {
            case "system":
                System.out.println("inside company");
                break;
        }
    }

    @Override
    public void endElement(String uri, String localName, String qName)
        throws SAXException {
        switch (qName) {
            case "u_id":
                systemTo.setUid(content);
                break;
            case "serial_no":
                systemTo.setSerialNumber(content);
                break;
            case "branch_name":
                systemTo.setName(content);
                break;
        }
    }

    @Override
    public void characters(char[] ch, int start, int length)
        throws SAXException {
        content = String.copyValueOf(ch, start, length).trim();
    }
}

数据容器类

package com.satya.xmltest;

public class SystemTo {

    private String uid;
    private String serialNumber;
    private String name;
    public String getUid() {
        return uid;
    }
    public void setUid(String uid) {
        this.uid = uid;
    }
    public String getSerialNumber() {
        return serialNumber;
    }
    public void setSerialNumber(String serialNumber) {
        this.serialNumber = serialNumber;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

我的输出是:

Uid: 10145
serial number: 1800015
name: null

但是我需要:

Uid: 10145
serial number: 1800015
name: B & P Infotech Ltd.

提前致谢.