我想转换我的payaload中的项目列表并将它们转换为hashmap。基本上，我有一个Item xml表示，它有一个ItemID列表。每个ItemID都有一个idType。但是，在我的Item类中，我希望这些ItemID表示为Map。
HashMap<ItemIDType, ItemID>
传入的有效负载将此表示为列表
<Item>...
<ItemIDs>
<ItemID type="external" id="XYZ"/>
<ItemID type="internal" id="20011"/>
</ItemIDs>
</Item>
但是我想要一个将它转换为HashMap的适配器
"external" => "xyz"
"internal" => "20011"
我现在正在使用LinkedList
public class MapHashMapListAdapter extends XmlAdapter<LinkedList<ItemID>, Map<ItemIDType, ItemID>> {
public LinkedList<ItemID> marshal(final Map<ItemIDType, ItemID> v) throws Exception { ... }
public Map<ItemIDType, ItemID> unmarshal(final LinkedList<ItemID> v) throws Exception { ... }
}
但由于某种原因，当我的有效负载被转换时，它无法将列表转换为hashmap。方法unmarshal的传入LinkedList是一个空列表。你们知道我在这里做错了吗？我是否需要在此处创建自己的数据类型来处理LinkedList？
答案 0 :(得分：5)
您需要将其转换为域对象，而不是将Map转换为LinkedList。
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import javax.xml.bind.annotation.adapters.XmlAdapter;
public final class MyMapAdapter extends
XmlAdapter<MyMapType,Map<Integer, String>> {
@Override
public MyMapType marshal(Map<Integer, String> arg0) throws Exception {
MyMapType myMapType = new MyMapType();
for(Entry<Integer, String> entry : arg0.entrySet()) {
MyMapEntryType myMapEntryType =
new MyMapEntryType();
myMapEntryType.key = entry.getKey();
myMapEntryType.value = entry.getValue();
myMapType.entry.add(myMapEntryType);
}
return myMapType;
}
@Override
public Map<Integer, String> unmarshal(MyMapType arg0) throws Exception {
HashMap<Integer, String> hashMap = new HashMap<Integer, String>();
for(MyMapEntryType myEntryType : arg0.entry) {
hashMap.put(myEntryType.key, myEntryType.value);
}
return hashMap;
}
}
了解更多信息
答案 1 :(得分：0)
您可以在此处参考官方oracle文档： XmlAdapter。他们为HashMap提供了一个类似的例子。
答案 2 :(得分：0)
您可以使用我的旧通用解决方案，但永远不会在实际项目中执行此操作，它不是跨语言（它仅适用于Java客户端+ Java服务器解决方案）。 SerializableAdapler.java可以编组和解组任何java对象。对于编组，它将java对象序列化为String，然后将其编码为base64。对于解组，它解码base64字符串并反序列化以获取java对象。顺便说一下，在这个解决方案中，您需要在服务器端和客户端都使用帮助程序（SerializableAdapler.java，Base64Coder.java）。在正常的解决方案中，您只需要一个接口，如客户端的SomeService.java（以及服务器端的SomeService.java和SomeServiceImpl.java）。我用http://cxf.apache.org/docs/a-simple-jax-ws-service.html测试了它，但您可以使用其他Web服务框架。
SomeService.java
package some.services.interfaces;
import some.services.interfaces.helpers.SerializableAdapler;
import javax.jws.WebParam;
import javax.jws.WebService;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import java.util.List;
import java.util.Map;
@WebService
public interface SomeService {
String sayHi(@WebParam(name = "text") String text);
String sayHiToUser(@WebParam(name = "user") String user);
/* Advanced usecase of passing an Interface in. JAX-WS/JAXB does not
* support interfaces directly. Special XmlAdapter classes need to
* be written to handle them
*/
boolean add(@XmlJavaTypeAdapter(SerializableAdapler.class) @WebParam(name = "data") Map<String, String> data);
boolean addAll(@XmlJavaTypeAdapter(SerializableAdapler.class) @WebParam(name = "columns") List<String> columns, @XmlJavaTypeAdapter(SerializableAdapler.class) @WebParam(name = "datas") List<List<String>> datas);
@XmlJavaTypeAdapter(SerializableAdapler.class)
List<String> showColumns();
@XmlJavaTypeAdapter(SerializableAdapler.class)
List<List<String>> getDatas();
}
SerializableAdapler.java
package some.services.interfaces.helpers;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import java.io.*;
public class SerializableAdapler<BoundType> extends XmlAdapter<String,BoundType> {
@Override
public BoundType unmarshal(String v) throws Exception {
byte [] data = Base64Coder.decode( v );
ObjectInputStream ois = new ObjectInputStream(
new ByteArrayInputStream( data ) );
BoundType o = (BoundType)ois.readObject();
ois.close();
return o;
}
@Override
public String marshal(BoundType v) throws Exception {
if (v instanceof Serializable) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(v);
oos.close();
return new String(Base64Coder.encode(baos.toByteArray()));
} else {
throw new Exception("BoundType v is not serializable: "+v.getClass());
}
}
}
Base64Coder.java
package some.services.interfaces.helpers;
// Copyright 2003-2010 Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland
// www.source-code.biz, www.inventec.ch/chdh
//
// This module is multi-licensed and may be used under the terms
// of any of the following licenses:
//
// EPL, Eclipse Public License, V1.0 or later, http://www.eclipse.org/legal
// LGPL, GNU Lesser General Public License, V2.1 or later, http://www.gnu.org/licenses/lgpl.html
// GPL, GNU General Public License, V2 or later, http://www.gnu.org/licenses/gpl.html
// AGPL, GNU Affero General Public License V3 or later, http://www.gnu.org/licenses/agpl.html
// AL, Apache License, V2.0 or later, http://www.apache.org/licenses
// BSD, BSD License, http://www.opensource.org/licenses/bsd-license.php
// MIT, MIT License, http://www.opensource.org/licenses/MIT
//
// Please contact the author if you need another license.
// This module is provided "as is", without warranties of any kind.
//
// Project home page: www.source-code.biz/base64coder/java
/**
* A Base64 encoder/decoder.
*
* <p>
* This class is used to encode and decode data in Base64 format as described in RFC 1521.
*
* @author
* Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland, www.source-code.biz
*/
public class Base64Coder {
// The line separator string of the operating system.
private static final String systemLineSeparator = System.getProperty("line.separator");
// Mapping table from 6-bit nibbles to Base64 characters.
private static final char[] map1 = new char[64];
static {
int i=0;
for (char c='A'; c<='Z'; c++) map1[i++] = c;
for (char c='a'; c<='z'; c++) map1[i++] = c;
for (char c='0'; c<='9'; c++) map1[i++] = c;
map1[i++] = '+'; map1[i++] = '/'; }
// Mapping table from Base64 characters to 6-bit nibbles.
private static final byte[] map2 = new byte[128];
static {
for (int i=0; i<map2.length; i++) map2[i] = -1;
for (int i=0; i<64; i++) map2[map1[i]] = (byte)i; }
/**
* Encodes a string into Base64 format.
* No blanks or line breaks are inserted.
* @param s A String to be encoded.
* @return A String containing the Base64 encoded data.
*/
public static String encodeString (String s) {
return new String(encode(s.getBytes())); }
/**
* Encodes a byte array into Base 64 format and breaks the output into lines of 76 characters.
* This method is compatible with <code>sun.misc.BASE64Encoder.encodeBuffer(byte[])</code>.
* @param in An array containing the data bytes to be encoded.
* @return A String containing the Base64 encoded data, broken into lines.
*/
public static String encodeLines (byte[] in) {
return encodeLines(in, 0, in.length, 76, systemLineSeparator); }
/**
* Encodes a byte array into Base 64 format and breaks the output into lines.
* @param in An array containing the data bytes to be encoded.
* @param iOff Offset of the first byte in <code>in</code> to be processed.
* @param iLen Number of bytes to be processed in <code>in</code>, starting at <code>iOff</code>.
* @param lineLen Line length for the output data. Should be a multiple of 4.
* @param lineSeparator The line separator to be used to separate the output lines.
* @return A String containing the Base64 encoded data, broken into lines.
*/
public static String encodeLines (byte[] in, int iOff, int iLen, int lineLen, String lineSeparator) {
int blockLen = (lineLen*3) / 4;
if (blockLen <= 0) throw new IllegalArgumentException();
int lines = (iLen+blockLen-1) / blockLen;
int bufLen = ((iLen+2)/3)*4 + lines*lineSeparator.length();
StringBuilder buf = new StringBuilder(bufLen);
int ip = 0;
while (ip < iLen) {
int l = Math.min(iLen-ip, blockLen);
buf.append(encode(in, iOff+ip, l));
buf.append(lineSeparator);
ip += l; }
return buf.toString(); }
/**
* Encodes a byte array into Base64 format.
* No blanks or line breaks are inserted in the output.
* @param in An array containing the data bytes to be encoded.
* @return A character array containing the Base64 encoded data.
*/
public static char[] encode (byte[] in) {
return encode(in, 0, in.length); }
/**
* Encodes a byte array into Base64 format.
* No blanks or line breaks are inserted in the output.
* @param in An array containing the data bytes to be encoded.
* @param iLen Number of bytes to process in <code>in</code>.
* @return A character array containing the Base64 encoded data.
*/
public static char[] encode (byte[] in, int iLen) {
return encode(in, 0, iLen); }
/**
* Encodes a byte array into Base64 format.
* No blanks or line breaks are inserted in the output.
* @param in An array containing the data bytes to be encoded.
* @param iOff Offset of the first byte in <code>in</code> to be processed.
* @param iLen Number of bytes to process in <code>in</code>, starting at <code>iOff</code>.
* @return A character array containing the Base64 encoded data.
*/
public static char[] encode (byte[] in, int iOff, int iLen) {
int oDataLen = (iLen*4+2)/3; // output length without padding
int oLen = ((iLen+2)/3)*4; // output length including padding
char[] out = new char[oLen];
int ip = iOff;
int iEnd = iOff + iLen;
int op = 0;
while (ip < iEnd) {
int i0 = in[ip++] & 0xff;
int i1 = ip < iEnd ? in[ip++] & 0xff : 0;
int i2 = ip < iEnd ? in[ip++] & 0xff : 0;
int o0 = i0 >>> 2;
int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
int o3 = i2 & 0x3F;
out[op++] = map1[o0];
out[op++] = map1[o1];
out[op] = op < oDataLen ? map1[o2] : '='; op++;
out[op] = op < oDataLen ? map1[o3] : '='; op++; }
return out; }
/**
* Decodes a string from Base64 format.
* No blanks or line breaks are allowed within the Base64 encoded input data.
* @param s A Base64 String to be decoded.
* @return A String containing the decoded data.
* @throws IllegalArgumentException If the input is not valid Base64 encoded data.
*/
public static String decodeString (String s) {
return new String(decode(s)); }
/**
* Decodes a byte array from Base64 format and ignores line separators, tabs and blanks.
* CR, LF, Tab and Space characters are ignored in the input data.
* This method is compatible with <code>sun.misc.BASE64Decoder.decodeBuffer(String)</code>.
* @param s A Base64 String to be decoded.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException If the input is not valid Base64 encoded data.
*/
public static byte[] decodeLines (String s) {
char[] buf = new char[s.length()];
int p = 0;
for (int ip = 0; ip < s.length(); ip++) {
char c = s.charAt(ip);
if (c != ' ' && c != '\r' && c != '\n' && c != '\t')
buf[p++] = c; }
return decode(buf, 0, p); }
/**
* Decodes a byte array from Base64 format.
* No blanks or line breaks are allowed within the Base64 encoded input data.
* @param s A Base64 String to be decoded.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException If the input is not valid Base64 encoded data.
*/
public static byte[] decode (String s) {
return decode(s.toCharArray()); }
/**
* Decodes a byte array from Base64 format.
* No blanks or line breaks are allowed within the Base64 encoded input data.
* @param in A character array containing the Base64 encoded data.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException If the input is not valid Base64 encoded data.
*/
public static byte[] decode (char[] in) {
return decode(in, 0, in.length); }
/**
* Decodes a byte array from Base64 format.
* No blanks or line breaks are allowed within the Base64 encoded input data.
* @param in A character array containing the Base64 encoded data.
* @param iOff Offset of the first character in <code>in</code> to be processed.
* @param iLen Number of characters to process in <code>in</code>, starting at <code>iOff</code>.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException If the input is not valid Base64 encoded data.
*/
public static byte[] decode (char[] in, int iOff, int iLen) {
if (iLen%4 != 0) throw new IllegalArgumentException("Length of Base64 encoded input string is not a multiple of 4.");
while (iLen > 0 && in[iOff+iLen-1] == '=') iLen--;
int oLen = (iLen*3) / 4;
byte[] out = new byte[oLen];
int ip = iOff;
int iEnd = iOff + iLen;
int op = 0;
while (ip < iEnd) {
int i0 = in[ip++];
int i1 = in[ip++];
int i2 = ip < iEnd ? in[ip++] : 'A';
int i3 = ip < iEnd ? in[ip++] : 'A';
if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
throw new IllegalArgumentException("Illegal character in Base64 encoded data.");
int b0 = map2[i0];
int b1 = map2[i1];
int b2 = map2[i2];
int b3 = map2[i3];
if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
throw new IllegalArgumentException("Illegal character in Base64 encoded data.");
int o0 = ( b0 <<2) | (b1>>>4);
int o1 = ((b1 & 0xf)<<4) | (b2>>>2);
int o2 = ((b2 & 3)<<6) | b3;
out[op++] = (byte)o0;
if (op<oLen) out[op++] = (byte)o1;
if (op<oLen) out[op++] = (byte)o2; }
return out; }
// Dummy constructor.
private Base64Coder() {}
} // end class Base64Coder
SomeServiceImpl.java
package some.services.implement;
import some.services.interfaces.SomeService;
import javax.jws.WebService;
import java.util.*;
@WebService(endpointInterface = "some.services.interfaces.SomeService",
serviceName = "SomeService")
public class SomeServiceImpl implements SomeSerive {
public String sayHi(String text) {
return "Hi, "+text;
}
public String sayHiToUser(String user) {
return "Hello, "+user;
}
protected List<String> columns = null;
protected final List<List<String>> datas = new LinkedList<List<String>>();
public boolean add(Map<String, String> data) {
...
}
public boolean addAll(List<String> columns, List<List<String>> datas) {
...
}
public List<String> showColumns() {
...
}
public List<List<String>> getDatas() {
...
}
}
P.S。：此解决方案示例适用于Java 7（没有正常的base64支持）。请不要编辑以后的Java版本。