我们都知道从http的请求中可以通过 request.getParameter("someParam")来取得 get方法提交的参数值，那么post请求中的body（如xml,json等格式）如果取得呢？

private String getRequestBody(final HttpServletRequest request) {
		
		String charset = request.getCharacterEncoding();   
		 if (charset == null) {   
		     charset = DEFAULT_ENCODE;   
		 }  
		 String str, wholeStr;
		try {
			BufferedReader br = request.getReader();
			 wholeStr = "";
			 while((str = br.readLine()) != null){
			 wholeStr += str;
			 }
			 return wholeStr;
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
}

    XML格式的String 类型与java对象转换类

 import java.io.StringReader;  
import java.io.StringWriter;  
import java.util.Collection;  
  
import javax.xml.bind.JAXBContext;  
import javax.xml.bind.JAXBElement;  
import javax.xml.bind.JAXBException;  
import javax.xml.bind.Marshaller;  
import javax.xml.bind.Unmarshaller;  
import javax.xml.bind.annotation.XmlAnyElement;  
import javax.xml.namespace.QName;  
  
import org.apache.commons.lang.StringUtils;  
  
/** 
 * 使用Jaxb2.0实现XML<->Java Object的Binder. 
 *  
 * 特别支持Root对象是List的情形. 
 *  
 * @author 
 */  
public class JaxbUtil {  
    // 多线程安全的Context.  
    private JAXBContext jaxbContext;  
  
    /** 
     * @param types 
     *            所有需要序列化的Root对象的类型. 
     */  
    public JaxbUtil(Class<?>... types) {  
        try {  
            jaxbContext = JAXBContext.newInstance(types);  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * Java Object->Xml. 
     */  
    public String toXml(Object root, String encoding) {  
        try {  
            StringWriter writer = new StringWriter();  
            createMarshaller(encoding).marshal(root, writer);  
            return writer.toString();  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * Java Object->Xml, 特别支持对Root Element是Collection的情形. 
     */  
    @SuppressWarnings("unchecked")  
    public String toXml(Collection root, String rootName, String encoding) {  
        try {  
            CollectionWrapper wrapper = new CollectionWrapper();  
            wrapper.collection = root;  
  
            JAXBElement<CollectionWrapper> wrapperElement = new JAXBElement<CollectionWrapper>(  
                    new QName(rootName), CollectionWrapper.class, wrapper);  
  
            StringWriter writer = new StringWriter();  
            createMarshaller(encoding).marshal(wrapperElement, writer);  
  
            return writer.toString();  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * Xml->Java Object. 
     */  
    @SuppressWarnings("unchecked")  
    public <T> T fromXml(String xml) {  
        try {  
            StringReader reader = new StringReader(xml);  
            return (T) createUnmarshaller().unmarshal(reader);  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * Xml->Java Object, 支持大小写敏感或不敏感. 
     */  
    @SuppressWarnings("unchecked")  
    public <T> T fromXml(String xml, boolean caseSensitive) {  
        try {  
            String fromXml = xml;  
            if (!caseSensitive)  
                fromXml = xml.toLowerCase();  
            StringReader reader = new StringReader(fromXml);  
            return (T) createUnmarshaller().unmarshal(reader);  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * 创建Marshaller, 设定encoding(可为Null). 
     */  
    public Marshaller createMarshaller(String encoding) {  
        try {  
            Marshaller marshaller = jaxbContext.createMarshaller();  
  
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);  
  
            if (StringUtils.isNotBlank(encoding)) {  
                marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);  
            }  
            return marshaller;  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * 创建UnMarshaller. 
     */  
    public Unmarshaller createUnmarshaller() {  
        try {  
            return jaxbContext.createUnmarshaller();  
        } catch (JAXBException e) {  
            throw new RuntimeException(e);  
        }  
    }  
  
    /** 
     * 封装Root Element 是 Collection的情况. 
     */  
    public static class CollectionWrapper {  
        @SuppressWarnings("unchecked")  
        @XmlAnyElement  
        protected Collection collection;  
    }  
} 

@Override
	public AuibInsuranceCallback formatCallBackData(String source, String sign) {
		if(this.checkCallbackInfo(source, sign)){
			JaxbUtil resultBinder = new JaxbUtil(AuibInsuranceCallback.class);  
			AuibInsuranceCallback auibInsuranceCallback = resultBinder.fromXml(source); 
			return auibInsuranceCallback;
		}else{
			return null;
		}
		
	}