今天使用Spring MVC做一个文件上传的功能,在提交表单的时候出现了如下错误:

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" alt="" />

之所以出现这个错误,是我没有为如下表单域选择要上传的文件就直接点保存按钮了:

aaarticlea/png;base64,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" alt="" />

看看JSP代码:

            <tr>
<td>
<fmt:message key="com.studentinfomgt.label.avatar"></fmt:message>
</td>
<td>
<input type="file" name="avatar" accept="image/jpeg,image/png,image/gif">
</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" value="Save">
</td>
</tr>

再看看Spring控制器的代码:

    @RequestMapping(value="/addStudentByForm", method=POST)
public String addStudentByForm(@RequestPart(value="avatar") byte[] avatar, @Valid Student student, Errors errors) throws Exception {
if (errors.hasErrors()) {
return "addStudentForm";
}

试了很多方式还是有这个问题,于是我想到了Spring API文档:

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1F9n5hMxS7Z2Zq5/TT258/SzZ77zSe03/z0eXgQwIAYCMI67pgdkpT3U2fvjg0I3+y5N79F9EzVDofaiLPAACKZ8YBY4cPz1spIiUKIUOPTl5YdLlMwtXN+63BbACwdoaiy+VllF727r/IPJ6xJ7pcXmbvNEX3mAAAKJP5p+lvOua6AAAAAFvENkWX7mfyAAAAACicLY4ucgsAAACwPWxTdAEAAACwtYguAAAAAApAdAEAAABQAKILAAAAgAIQXQAAAAAUgOgCAAAAoABEFwAAAAAFILoAAAAAKADRBQAAAEABiC4AAAAACkB0AQAAAFAAogsAAACAAhBdAAAAABSA6AIAG8PZ0U7F0dm6y7JamiPfP3netczzk/3hhbaXV/zwgW1lifX+tNbYompDdAGAlTG9ROXZP3leXWteqehydrSzc3Q27sjPjkq7CE++9AUVubzD33bO71y/fud83aVA6QzUflerRbas2hBdAGBlnB0FV6f4WvX8ZL+6uEQLvQI8P9nvPN7pWel+Z+30F2nyNc9X4vZ/hQ08/GVxfuf6zuaHgtMbOzdO110IrIyBP8Ar/H321vtXqUX6i1Xi5UZ0AYCVcXYUXD7S22zPT/ZfyehydtR9Td6C6HIVlhZdzu9c39nZ2bl+57z+50Ib4Kc36n7EK2SPEqLL+Z3rHSeuPq1XPw/LY/I1ra5oS/5ftxLWFF2uiOgCAFgAXSMESryWXAXRpZPl9bpMWq03Ti+X2YDtHkt1fuf6BjdaT2+MPBunNzrOW3ek2TBmHe52tS9uJf/rlovosgGILgCwHoaiSzAxJl4omHmZv+bUa+6fPO+apRluIxnC1lrx6CxeYcbSxGUKSxIVolXE1sSgaTl6DmywQMFBnnVtI1fY7Gnd30+OINlj+vSBZud932/fuRk+/GCzPU2o0xs7dcNxcgN8GQ3tbY8u3YPFihlGtoboMvi/Lvd3lqkxuquhyYrTiYPTDWSfBtK10bgCiv9ie//YWx/n65PcYR+dZaqF+WqRVnFae+6uf7OXh81BdAGA9dAbXaafTF7GV8HwEpa/FCbX/K55NckGL6N2Q7id/IZGliZeKTmgeXpd0vIkxR8sUHWQSYMoPOHVvzOD+uo1p4cxcKc1nSKb+3471u7odek8/Ki4vbdTz+9cbxqOpzea29/VOJ4bp9WQrxun09Ffk6WbJaoN1Z/mGsC5dnEykGont3bneLPpzsPN5BeqSVvH0eE0ywanok3nkLD2QWcPL1ks2km87Xr1yRrhua17KU7bg65myh7hzifnMVi979SN+OIGznzn/7o22b+z7r/tuEqp/sCil+lA3XjVzEafn+zH1VxYI8zS69Jf+QXkip2vaYOlO2qRpF7om+PfriaibV1xks1yEF0AYD2MHTCWXlCDD3ueSpMEgnajNr5GxpvsvNDPU5r22/F19ooDxnqSRufpaW92WqT4Wp0umSvs0CCR3FcRFKonu4wYMBYukkuhXeUKxjqd3oiamed3rkdt5+YuedPQbN96z/dTXLHXJb/6+Z3rN25EnRq9jeD8jJnzO9dv3Ina0eEyo3pdejtWOj9Mi5Mt3umN63fuRHlysrHTGztR5GreHdkRkuwsmHoyZvH6vbG9LrnVu//XJbT/zrr/ttv/z6O156rB2n+k80WXocovOeRMr09YTY+sRdpxY4YBY63ybeAjL0UXAFgPc0SX1irdrdO+6JLsa6d19R4XXcaVJrfnaMHFRZfRp6fr3miusdS+2bmp0SV7e3n2NkfQOg3DQ9CeX3d0abe2+7aXa9qHt/9zawxGl4HJLB1xoqujJtMtkytBUK5gB9Njz/cZBWGhvdHO2TodhzHTgLErDJtr/Z11/21nOjLGRpeeCiMclDVZ7flQT3fm48HKL32/u/tjfC2SqcvGR5dM6TYvu4guALAe5o4uKXNEl3pDzTiM+aPLUGlWHl1GnJ7MlTwsUjCerKRel9bg9qjpNZrNjy6Zd8MCtIc25aJLb/AYii79Lf7ORnvnaYoX7tr/UHTpJ1um5GwOnrr+nY048yPpiC65v+3M389s0aWrwshO+Fh5dAm7VGeJLmOf7iG6AADGsohel256oktuIPRCel1GH+aqel16y9TR6xLfxC0uulx9VHrZ0aXdKdPR63KV6DLYnVBkdBlz6np2Nu7Mj2S41yVa9ErRZajCiCahFNPrIroAABbNAua6VMt3jZzuiC65KRGLmOvSUZr1zXXpPD09c11y3VOFRJeOZsesbY45oktHRlnagLHuKJLZ8MKjy4incl11wNgyosvQgLFRp657ZyPP/EgG57pUS+W7Xead6zLdaFJrPD/ZD3PB6Ohy9bkuXdXk8FyXcFPmugAAFkDXY1/Sa0f7ChY3rbNXpPR604ou8ZT97qnt/a/HlSazTv+NyWTNvgtp8nqWAiUjQzIDxZPlOgqbmyfTefRD329Eexh//+GnJTk7mqPJMRxdovFSPZO9e6NLsEbwYIDh1c/vXL9+PU4vcTs+ncG/M8eAsXCV6eT41t76tjDysWS5oWdLii6t1Bf/tsqoU9f9xY088+PI/p11/m3nupHTezPx3Y3BGqzdF5HfV77g3RXW4B/72GpyzFUieZmvC9p1TLSpXAWz9hwjugDAqmkPsU4uDc2b0evcGOzsVTCc9DAdAxXsKngj2Mn+0VG8t3Tv85WmXabkApx5P7ve/snJ0IGNLNDkJuT+fnvleP1wH9EvLuxkLvbZPSZfxajvNy1os/jg99p9okcSTFa4cRrHkridG8wInz5AOfzFjhaZh01lPxtafdJSj5bqerRy/Fjh886tDzzjuPWM4IHU0yIdDta57561kwdGB8kgfVx1L+l5i4Nn76nrOr8jz/x4eiqF7r/tqEpL+2yiv8/m15z6arCzo6h66NxYR+dJ8vGov8mzo52js/gPPndGxtYi0ZZOmhcdXdDJLrvOczALcJ2ILgCAV4yhIV7YXGZ6xtXCGZqfj02gbwwqykd0AQC8Yogu5bLe6IISEF22G9EFAPCKsYEzTzGCeLiXBIMs/ry3HNEFAPAKkUw00sABtof4z1vXy1YiugAAAAAoANEFAAAAQAGILgAAAAAKQHQBAAAAUACiCwAAAIACEF0AAAAAFIDoAgAAAKAARBcAAAAABSC6AAAAACgA0QUAAABAAbx2cXFxcfGSJEmSJDdZ0YUkSZJkAYouJEmSJAtQdCFJkiRZgKILSZIkyQIUXUiSJEkWoOhCkiRJsgBFF5IkSZIFKLqQJEmSLEDRhSRJkmQBii4kSZIkC1B0IUmSJFmAogtJkiTJAhRdSJIkSRag6EKSJEmyAEUXkiRJkgU4Nro8+fjdt95+460Pvlpmab46ePuNt95+46233/jtx9+u/dSQ5Nb67/+7fnC8e/DF18vcy7d//cvuwfHuwfHujf/7du2HTJIs31l6XZ589NvlRpfKJx+/K7qQ5BIVXUiSBSq6kCSX5zd/El1Ikgtyjujy7fG1aljXW2+//2V7mbebT989fpJu5MsPmk87h591Rpev3p+u2x5UFu062fhkKNq7x0+CAlz76Mm6zz7JV8//3LpxHPZFfP1p9fL6X/+TWSbb7n/4Rfjp103nxtS/3Pr3ZOFv/jR559NvMutOF8ts+U8Pm86ZuH8m2sLxnx52H+DB8Z8eii4kyYU5a3R5/+DtNw6+qt/56v0ovSQvL76KFr749vhalDeefPxuNj/ko8uTj34bL/zlB31zb9ob//KDd38bFKB/dZJcjnEsaeeNaVrIRpFgFFafC4guqZ9+cxEErfZHFxddhRddSJKLccbo0u5I+er9OgB8ddDuhAnezAaS0W9+e3ytvfGXTz5+v92x0971xFZW+epAxwvJ9VgnirDdf/GyCTZRV8YkTkwWq7JBJsk0q3z9aZxJJqtEe8ktFhiko3iBSUmiHDIp8GSxOpVN91UfpuhCklyEM0aXTFu/DgAdM2G+/KBKO80/0m221spFl+nDxxKDJcORbJnxbK0CiC4k12XVpm+NtgoiTeoXX9ehIllr0hOy+OjSyhs9HT7X//qf/LSWyd5FF5LkIiwoumR6XQLT0Wi5XhfRheSG2DUDpCe6/OXWv9OUMjHJM4uKLq1Y1TtW7dNvOnZkrgtJcmGWMmDs5ZcfhNNmcmVLI5DoQnJj7WrQh+OvclZzUYIF6tkpHdGlNdflIrtYZFd0iYauZawGjAXPG6jnxoguJMlFOMc0/SAAtKfpR/nh2+NryTT9ODx89f4M0/TTSf8vo56WJx/9Nn1ggAFjJDfPronsgzPd65iRnygfJI3OvpFPv+np1ZnkjY6NTxNO196r8vfM8s9mIZIkZ3FsdHny8bv1E4eDaSetpn+1WG2rnySeshKt3p6pMrxMtP3w0cnXPnoSPBA53G8VdaYL54axkeSSHIwuFy+zTyHLTNyvZ8B/3eokCQLGF183e1xEdEn3Xpch6FSJdlE9HFl0IUkuwll6XUiSm2fn+C6SJLdL0YUkSzXtJDGlhCS51YouJFmqogtJ8pVSdCFJkiRZgKILSZIkyQIUXUiSJEkWoOhCkiRJsgBFF5IkSZIFKLqQJEmSLEDRhSRJkmQBii4kSZIkC1B0IUmSJFmAogtJkiTJAhRdSJIkSRag6EKSJEmyAEUXkiRJkgUoupDkJvvgcKfi8MHVNhVuadnFXuW+OJvT72bn8MG6C0OSsym6kOSqfHp3bydg7+7T+qOnd/eCduR30XKHDybrXTW6TLe8mjixyn0txur72cwG/bRwi9vaZh4pSXYrupDkSp3c9I5zSK6VX6WZlxcXVSfGHNGlWq/3nYUe14r2Na/f3d2LEuOIr2ZjrAu3oA3WX87aj4skZ1F0IcnV+uBwZ2dn7+5303fq3pio0fzgcNqyFF0W40B0eZUUXUgWqehCkiu2yi7haLG9vXSo0tO7e9OsIrosRtGlUXQhWaSiC0mu2MnwsL27T5uXe3efNuOBmjeDRn8dXeIZ1sE2w1k0k/ZoMq+m7uepW6ydc7XjLU3erBfeu/u0/jjba7SIfYU2Kx4+iLbRceDTc5Ir8F5SxuyYveT9YK+twoflD76aaIxfeDbaO9rZ2bv7dPLtTzdVLdysvnf3aXiiqjL0fCPfxf8Vus5V/ohIcsMVXUhy1cbT7h8c7t19mky0eHp3L+wcmLaLg5fxcLKq5fp00q9QtZU7ekKmbyazO+r+oKaQYb6q28odky4Wt6/Q75qxdOE2cweb9GVlCzzQ6xJ/L9/d3YtLm23oTw9ymkij7UQ9ZnFArdaNXgY5Jy5tOrE+e4DhSYhXj7+1jX4gAUl2K7qQ5MoNm6EPDqMb7cmbE9MBY2GrNJniH70cHsQVtv6TxnH88sHhwFCrBe6rd7PBAcbN8WTJXIGHBow9vbsXpsekBybb0E8Xe9kKUdOXYVrLFDKOna3SfjfZU37di5cXafQKXyZ9ei8NGCNZqKILSa7eaVPywWHTls2++fLioje6tBr9Yft4pjjRegRz1ARfbHTp39eIzebSws5Co8t05FW9zaffZVZsR5ds58l04FzrWBYWXVrPqWtKkukoE11IFqnoQpJrsG6qV6PF4je/u3sYN68Ho0vK/NEls6VmxUVHl6599W82jD3TZ7MtvNelWb4m/5iEjujSoo4u8d6XEF3aJ/W7zEPtRBeSZSq6kOQanLS59/b22gPD9g4P95I25Sy9LqFX6wlpbWqJvS6zbnbn8EF9Djsm9iwiukTnP/+0tOFel8bVRJdcIUUXktui6EKS67DqL0jmpjdt5HjhGea6VMvHz/iafjTD/JNq+aADZ3lzXeJ99W52erzJ1JEFR5dkutHTu3vZBwkMz3V5eVE/6nrFc12qwuzdfZopkuhCskhFF5Jci9lmdMeN8/SuedwSTWYyBE8na08LSVvP8ZaT5Z/ebTqFuu/oR1teyL4ym02eMDZZK9pC2jGSLXDyWOqWYQmTuPjgMJ95cn0sSXfQ9NdF6w+iLy6Z0F+XORwLl/nS8weYTD36jPIAAAiCSURBVKepnrx80Xqk2DQ4B2c1e/5JcqMUXUhyPT44zDQWn97dS+6Fp79cEr2uW+Hhm2ELO/rllLvJzI10S63dRc8dDsuQPaLF7CtzluIfZQmDR1Cw4Mzs3b3bWeBgjWzemK7y4DD6KZhcboln7GSerJA7Y1GZ056TqHgP6s0H/2wK13WA6e/G5IsUnqL6sc46YUgWoOhCktxc2+PQtsnBYXgkyVDRhSS5uYouJMlG0YUkubm2p7ZvkcMziEiSoaILSXIzjWd0bFnvRDpRxhR5khxWdCFJkiRZgKILSZIkyQIUXUiSJEkWoOhCkiRJsgBFF5IkSZIFKLqQJEmSLEDRhSRJkmQBii4kSZIkC/C1i4uLSwAAAADYbEQXAAAAAAUgugAAAAAoANEFAAAAQAGILgAAAAAKQHQBAAAAUACiCwAAAIACEF0AAAAAFIDoAgAAAKAARBcAAAAABSC6AAAAACgA0QUAAABAAYguAAAAAApAdAEAAABQAKILAAAAgAIQXQAAAAAUwMzR5fTW8e7BxHunzx7uHdz+/Fnw8bOHewfHNx/NX6Dz+7d3D453bz2efxMAsMU8uldXwse7SQ0MAMBWM1N0efH54XFwyayMgsqje7sHx3v3X8xdINEFAPoQXQAAryqzRJfJ9fLw4Xn1ukoyi40uAIAxnN4SXQAArxYzR5coljy6F1w4H99sdciE/SfRSLOmdyW/QBiQLi8vq3Fok/c/j7cTEHYK3f78Ub2KSzuATSGqJ/fuv8i9k/SrtOu6ikx0edau9+rth13Z8favMsQXAIBVMtOAseYSm72Ojo8u+SFno6JLalOSjr2LLgA2iDHRJTs0N1Przhdd8lWxMboAgBKYcZp+K0KkY8MGBowFl+QknEx5fDP/aXUBbm4Qhpft6mI8vfrmbjQCwCYw6fRoaqdJvdpZJXYODBv7/mT7k92l434v62rZLR4AQAHM/3Dk5tbdLHNdqujSOxmmN7oE70+GnN181Gw2viuZNA4AYFOI0sKkLo1HbbW7kRcTXaYjdVuaowgA2HxmiC6nt1rxILyZN2FUdMmP264RXQBsO9MKqlXj5cfHLj26qC0BAJvP+OhSj/UKLm+ZBxmn0eXxzWiBJUUXA8YAlMWkjrr3+f3bye2ediC52oCxuDJ0TwcAUDKzR5eOSfYV2fuFzZ3Ftk0USZ+oE99rjDZ77zSeaXrz0eXgQwIAYKMIOkCiuzlDHSOdjyRp8k/nFm49vux5YoraEgCw8cw4YOzw4XkrRaTkfy5t2dHlMglXN++3BrMBwAZR1YrtEbZh9ti7/2Ja3Y2LLpfJw+ib+rOpD9v1bfdDAgAA2Bzmn6a/6RgXAQAAAGwR2xRdRj2TBwAAAECJbHF0kVsAAACA7WGbogsAAACArUV0AQAAAFAAogsAAACAAhBdAAAAABSA6AIAAACgAEQXAAAAAAUgugAAAAAoANEFAAAAQAGILgAAAAAKQHQBAAAAUACiCwAAAIACEF0AAAAAFIDoAgAAAKAARBcA2CTOjnYq9k+er2A3S90LAACLRHQBgLXx/GQ/Fx2en+xHoWKSMxYXMs6OdnaOzqrdHJ0taKsAACwZ0QUA1sXZUUcieX6yH3yQJpkr8vxkX2ABAJSI6AIAa6IetNWOEXF0WcJut3WY2LOHewfHe/dfNG+c3jrePbj9+bM1lgkAsDBEFwBYD2dHR2eT9NLKLqLLXLz4/PB49+D45qPgvUf3dg+Odw8fnq+tVACAhSG6AMA6eH6yf3R22THfJIgu2fn007n8SQqZbK5ron/8abBA9EFTmObdo7OeHqLNIZ9ScnkGAFAmogsArIEquXRMZEl6XeI5MWdH0wgRJ5+zo3iCTL5vJe11ibaef0LAzs7RWbagk7RwcLx76+EkIWTCQ7NM5b3T5P3D23sHx7sHx3v3H96slgmHeL2Ybrmv/6Q7ouh4AYBtQXQBgNXz/OSobxJ+OmAsTBvx8uGSSSYJ9hERL9Z6VECchgbm9KexpB0w4uARppeudcMtPHu4l/k0N3elWrLORRGPb3atBQAoCtEFAFbO2VFnt8fl5WV/dEmWCsd91V0kTa55PhhdMg85i7LL8OPIqszQBINJVslGiMvLZN58kDfO79/ePTjevfW4ShqHD8975q7cepxut69rxZgxANgSRBcAWDXhVJXMHJPB6FKtv3/yPLvkwG9aLiW6BFmi9VCvxze7uk2CB4Kd379dB54murRXbI06qwmST4bTW6ILAGwDogsArJZmmsuU9EFjfdElXrbjWWRVh0w2vKw0uvSP+Hr2cK/+9/n923WfyZjo0hr9pdcFAF4BRBcAWCmZ5NLKLj3RJXkkWbBkuuGzo3zoWORcl8uB6NL+WZU02NRh4/z+7fr3WJIBY+PmqJjrAgCvAKILAKyQrihQDfQK+zqmeSJME9Es/ahzJbNSLnO0HsececLY9NNMr0xIONU+mJ3SdIxU47j6PXx4Xo/42rv/Ihhgdu8032mTzSFzPGGsOn2b/MBnAECI6AIAKyL+WZX2z6dk2D953pq9Eiy/f/J8+vjik5P9/f3c77MExLNsskVIE1PvzJmh6HJ5GaWXvfsvJtNOxkaXy8vsM8ryQ79m/l2XYM4QAKAERBcAwHbQ/UQyP+oCAFuB6AIA2BaCR5ZNaE+2AQCUi+gCAAAAoABEFwAAAAAFILoAAAAAKADRBQAAAEABiC4AAAAACkB0AQAAAFAAogsAAACAAhBdAAAAABSA6AIAAACgAEQXAAAAAAUgugAAAAAoANEFAAAAQAG8dgEAAAAAG89rPwEAAADAxiO6AAAAACgA0QUAAABAAYguAAAAAApAdAEAAABQAKILAAAAgAJ47f8BAAAAwMbz2rp/WAYAAAAAhhFdAAAAABSA6AIAAACgAP4/xpqmgeN80XkAAAAASUVORK5CYII=" 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AAALqgSAEAAAB0QZECAAAA6IIiBQAAANAFRQoAAACgC4oUAAAAQBcUKQAAAIAuKFIAAAAAXVCkAAAAALqgSAEAAAB04bmKFA/LdxuL1fqUrx/5/ddqvVrsGmb5MMsQDy091xB5WYc+0uW60/nktR0mvrGyXPQccgRLvBeH3dkRezOLcWajNpcX4sQj2qvxvIfuY5aK1ZoZnLRrYYKBIkVwyhqZtnY/LN+9Wz5sNw5HL9HN121XMpuFNOeakiyp7VbduvgMztTWD8uj1p3nWvJHTt5zyptivVq8W6zW4yb+AuYwsdmsnHGSTxnBeTrmrEO9vCV+ZvHBxGKxmNg4x/aX0447Bhbj2deSC5W3y6TNZefmOaK9Guc4dC9sq6cslcvrhbY0s5h1H28D8BxGXEmRLdVdJXLk+rJeLeZZjuvVIhzpw/KI/pEM43U4qiUmDHH+Kkg+juuUd8fztPWx/f48U5NPzAWslllTPCzrk3wRc9heAc9eEz5pBGfcJB031ItY4rOatP0u7bsnNk7aX8a374QpnboYj+nE17Djy9ultbm8MLMd0V6NM2wLs211a6lcxNb5hffHUyama+1Jn3Uff8nNNEYfszfmdo/SYt0WKsasM7PtnRQpKs5dpDiPPlaAl/Vs3bGrfn8RhwxDmkeqFzGHVsAZXcQSn9WU7lM4BnhYntg4XRQpjjHLevfzS3Rp65ef477224+PU78yj9d0Yn+J9ZahBX/oTx9//Db72J9jW/jK/9PgmXU1MdOcbdIVKV7GsUWKCZfNvKoixc8v59iGn0iR4lIpUtRe6Z4iBYGLWOKzmnrqn372YXla57vmIsXPLyeeS/78okhxtEssUuwMLPjffnxUpHghXe2Pu5qYaRQpZtPH7B1fpMirFME9p5slGTzWMXw5ujl1t8z3n00/U7q+c8yA8ynOHrCR3M+Qjq/kMooUYfukN+3V5jNr080302dd7f9ePlQfsll6kkn0gdryS96prx3lj42ZtvpwNh9LO3H+eJzwO+n1rPHLQZ9+OHxp9528O67KzxUrz+zu64vVep0PvDijxcmotkT2lLMRY8w7UXGrHs31vpdVhlsYbfZepV2Dl4pf2U/BQG9JmqK+ITluDmv956n49vKhNrXj14rForYCJiMLXo+XbTaJwfRlD0vLH542YQTZRv08HfOYoZ64xGub6ez9oEl3n6v2lmTztF4tFqv1mN1rfaCNJdBolUIL5R+bvLKmHSptvvCdqK2G1/LJi3H6WnLyjm/j9FPJsxYpknZpbi7z5VU94gi/Oq4/px8t7f4mrWTV5VdYlVsDLk3emAV/ulOKFPmySo6OqseXwelduJ94Kmx2n+JXB9osOUYtjftM++OBbpWNutnhzrA/Hrf/KvW+oa37wJFI43htzHlJ6cEC4avN2RqY9Nn38cO7lrPs49M1cVPvP2kfn/Wmyfv48zmhSLGb3WA7ES76qNMGMxi+mfwPy8PyXb4alooUhbFs3o4GVe0ThcPXuF+UvplcX7kVbvB3n/jy8ym4vG7zic17++1/8m5xFOMPQ/L2jlbasM+WGz6Z7bT8VP50vLjj48rKaBpTnQ1o893q7iE6UEy7V23aChNQaKhCa5S76KFn17t/cnieNO1Qd2y3SbIPaLX29qOVAVVbIh1kc4zN5ZJNTPEcMhpusuZvXjksm8aKm4y8sF1JtuMjekuxKSZeSVGdw8bmM5uEdJ6rPbi4VgQjHiiTZ6t1NLXN47bkEGDUYimPoLZRP2PHHDvUwlen9OnqOhcrLbmhrU2y7Yn+rO5eawOt7lYHuk+heXbiL01bWauHA+ksBOtnaS0/x2Ict5Ycv+N7qhyFBAcRwVX9yTvZcCrvhUP4+ONnctI6+hCl2NnKbZ4vj0Ofa7XMwOFiPoraXnjiSpYe0TZW5eJ2NzByy3Q4eizelTHq4PLw2VOupGgsq9aBX2NT8/RUat7hLWNxILUTqfPsj9vdavh4+9z746H91+DKVZ2Y5pFI5XittlhrO5h6NxgzWwOTPtM+fmDXcpZ9fLygkgP74/bx1d40aR9/NqcUKYJ1snWgEW88Ck0ct+GxRYp0L/iwHFOkyPtk6yB2xJUUv/34+OXHj4/7PUTwhey7v/34eNhhZLuHn1/G3jfa2Bwe/mw0fL6A222bN/VhyPE3G2tmtgJkDV/bXhSOxMdNW6TaUPEo1qtFZav+VN7+Pg1tmwa2XNEMDLRJsl9ubGCzEQXdodUSpeasjLG9ejYnJn8l+XZ+ANJecZPuvVwmW/logz+mt+SfPaZIUZvDgfO0WqtErTBprSgPrTC28kb8ab1ajjn9Gvh7eAT1jfpZOuaUoZa+OX6JN7c+rSl6avSWvN9E09/cvdYGWl8Ckw9g9jWr6Lhu/MpaOpKoLpxwd5dOaWOvdNqm6YS1ZMyOb2/slRS//fhYKSRUzlV/+/ExfP3nl3fh2fCkQ5TSqlObpbxFCiWK/VCidWhckaK9F560kmWzNmX3WZzxcWW/n18+fgyWZtr07YPL8HMn3u6RL6tNU7QO7Ic2wbNsGY8oUpy6P251q+H2OP/+uLn/aq9cYyomlSORfLzZ++l5Sb7uDx6e13fLA5M+5z6+uWs5yz4+H0r07aP28fXe9JqKFMX6Tdjd62eJ4RdPKlIchrdfYOvBzUqp4zSrFGOKFLUdd2s/Ut6l/Pbjy5hjkaAlshkqzE3a8IXle3yRIj9XrHXywsHe4IloaRDvWpNaXZpDDbXdxywWI4bV6v6V3eO7YM9eL1IMtcnJ51DvloVf7MqW4MgtensXODwxU4oUQytuMMD1avWQrCLxjuPFixTNzWc2h/mKWmqH9lpRGVr+flKRC466ChvXU4oUlRFUN+pn6ZjPVqQYs5kuT1Gjt1S246N2r/UuWF0CRx7A7IeXLJ/hlbVdpGgsm2crUhy1lhyx4xt/u0ftnLRepKgOeOIhypQiRdIG1RpFe9c6fbHW9nIDm+R8rRq7+6wrbLRjWUEoPpx8tiJFZVkF8gP7CUWK47eM8xUpRu+PB7rVQHucf3/c2n8NrFxTixTx3mf4eC097U52MO1ucBFFirPs4wv9a3SRotGta73p8osUh9f3W9hIrcNuP71YrZM2Pa1I8RT09+rW/jmKFLWdQGs/Ur6Z5N24mz6ybXwqqkZkDV+Y4ROKFMlEjN7OTTlW241g3/eOLVJUGir4RLYfqxUpKt2/tmHrpEixKNx8FrbE1C160BS1VehZihSHIW7LwvsBRqc9HRUpKv0nkm/ysoP2cWtFZWj5+9kUNxfuKUWK6gjKG/WzdMxnLlJU1rnmFDV6S2U7Pr5IUeuC5SVw0gHMdnxplaK5sl5AkeLpiLVk3iJFcr/Hu/qPOVQOU6Ijkfg0uNRF3tUOUSYVKeKD++j/8c5UpBioJYw/op20+6xM2bviRjuWHT2+VJGivKyenhoH9pOLFJXmzCfjfEWK2sJvDzbqVgPtcf798XMWKVoHpkOLNd/BtD9/QUWKY3pyowcWpm5akaLarYu96eKLFMHLzfP6uBPEA5u5SBFP2ojNSk9FiuMfZNUqRMcfKjb83EWK3QWA46e6MhXlmUmKBycVKZqbsu1zgZIeVytStE5ty9WB4rvPXKQob/fKUzM8xvicouo5ihS7QT7sDqO2cxJPYkdFijHrTL7J26/V09aKytDy9+vlvdL0nlikaI+gcF47d8d85iLF6HUlX+TV1j+lSDHUBeMlMP4Aptj6pZJie2W9jCJFNDlj1pIZixT57R0Tr6QofOzdkYco04oU4e5oGW3EzlSkiLaXE1aybNYm7T6LMz3ulKCfIsVhlsMjvdaB/eQixTFbxpmLFGP2x61uNdwe598fP2eRIprfUcdrlaEOH5ReUpFi5n38yUWKoW4d96YLL1LErVXu8YfuXtukz1ikSE6N16viw2SKo4jmrb0oZy1ShDuMU6oUYUuUz952TyAuN3w+yycUKSoN357q4lRU1vJS5WB6kaLaUNujlmVpxS6eBiy2Twcqd/98w5b9F069SDHUJidsX4PPtlpi0hb9YTlho3zimcDwipvuvLd/R9/po0jR3HyGsn3GoRWmrRXloRXGduin2U608M3jixSVEdQ36mfpmM9WpGhvfVpT9NToLeXt+Ljda22g9SUwqUhR7n1piaG9sraLFJXjt/268QxFilPWkhE7voPKqWTh2OPEIkX0wWmHKBOLFLtmWS5Ht8xJRYq8RjZyJctmbcruszTL9XP3yNQiRWVpzfMTpPmyah7YTyhSHL9lnK9IMXp/3OhWI9rj/Pvj5v6rvXJNLVI0D0yz93efWqzWlR1MsxtcRJHiPPv4fKCjixTVgdZ706UVKbIVutDBo81QcaMTfS49MonLIdlxSmlLV+2aD8viFiudzhHVlkh8Z+DPL+/SyykbRYroqVTbiyeTp1Rlw9r9x0g+3YF41pN2WYe/QVdp+O3f8UJKm7r6Z+lMPlTp5HntKz9wqB7jRdvS9JixPm2tCVjvHiO//0f+qbyhgoORRvdP5ipp+PrRU7tN0iYa2r5WB1RriWxq2mPcrbF7rdP95mH5wIwWXqz9x0B79zOhtwytBCfNYb3/5JOQzHO4Oxm9VmRfr87D5u3CMVZ1+hrNGf89YgT1jfpZOua0oRZaa0Kfrq9zrSkqjmvfW5I30t10c/daGejAEshONUpNW6g4lA9yB0sO+UahcViyb5YJa/lJm6Ypa8kRO76DepEie+zlpNs9slcLQ6weosTSuRg6sHoqb4+aLdM+XMynprYXnraS5Qto9O6zOcfZRjs2UKQYOLgMvjVHkaJ2hls7sC+doycbknSzNXXL2FxtzrQ/bnSrESc6598fj9kFjTskTDWORArjrXxmsVo3djD1bjBtz1qc9Jn28aNOhebdxycDTc5IjtrH13vT+H38OQ0UKbITzq3iMgw/HG94wxeDA8bFar3/RP6F4PeHo58iTlf97dcfltGPDVfbMRpD4bx6qG4U3fRZ//GvjfwSvPCd7Z/RL3xEXz+8kzRTZQmVDsrTSkSl4eN2We3/WK7Clt/9SM5hfOvCgil0m8YmfnjKU8HggylIOklt2qqTsPnAftiL1bo4OdUpLHeizQZgsSi9lzV7OgOtNglHFy7PcnNvto+lvl8fSbqox4wxOx0st3ulsxWHW9iGDLR5PNPxPKZ7o8OXW71l3VgJTp/DMfNy+EjYmfJTtHRukk5VOFArjjFZ1uvVotGHs2+kvaXw97gRlDfq5+mYxwz1tCU+tLFrdbNqb4m6wcOy2kei3Wt9P9jYrSbdp3GW+LCMW6T0qfbKmi2NbG7yPU96uDFun3DspmncWlJquOy1+jHg4EFG+OCIw09W7j5ReaxEenJbeqs2BcUz3rxd3kUvVObuofgfS62WGejP8TDKy2biSlbZGw3tPpuV7/2wDhvt+MPZD4+Wfom0dXA5sOCL3ar9PLT8hKt2fLkqrXHpsXvSnpO2jOnOpVEZ3A5wrv1x8+BuVHucb388bv9Vb+jGxDw1j0Qay6I0ttZ5W/nzg7NVn/RZ9/GjTjfOso+PutbDalGoI6TT2NrHN3rT+H38GY25koI+1ApxXcn+i6z40vVI/4fw9SrM6fXM/PO46jXpaFfcMdMiBfSr9kOKcwz5OtZ3ntX1ditHIt1YJ0WK10eR4lLULunqSnGr/frXooar2Y8Vd1tOkmbl0OAI19wxr2Q2eQXWIx9ue+SwrQjM7Xq7lSORbrz+0ytFiotQvhCyQ/n9YNe7IX96ehp1h/HrULth7wpm/dkM3OJMyRV3zKvZ+HCpdl30nCUKKwJncb3dypFIN17/olCkYGbpAyle9frTlNwH/+p3Ztl9/69+jp9RvFpd70p1jGvsmGMfBAAvKX1s4uyubS/Ms7jebuVIpBvDz2J5DRQpAAAAgC4oUgAAAABdUKQAAAAAuqBIAQAAAHRBkQIAAADogiIFAAAA0AVFCgAAAKALihQAAABAFxQpAAAAgC4oUgAAAABdUKQAAAAAutdQLxMAAAPmSURBVKBIAQAAAHRBkQIAAADogiIFAAAA0AVFCgAAAKALihQAAABAFxQpAAAAgC4oUgAAAABdUKQAAAAAuqBIAQAAAHRBkQIAAADogiIFAAAA0AVFCgAAAKALihQAAABAFxQpAAAAgC4oUgAAAABdGCxS/PrL+8yf/vH72OEfvv7Lr0dM3ubrR30VAAAAuChHFSlGFyrCL89SpPj1FxULAAAAeJ1GFinCksTv//jT2KrDyRdChAPYjleRAgAAAF6lI4oUhXLBrm4Rvhq+thtAdFnGfphJKSP8c//vfGjuBAEAAIBX5agixbZksH0xvyHkT//4vVCkiF8IChqKFAAAAMBJRYr3v/ya1CuekopDvZAQDnZMkeLJ7R4AAADwup18JUX5wZrRRRZxWSH8giIFAAAAsHVckSKoHVR+/aNwI8dJt3s8KVIAAADA63ZMkWJblxhROshrDNsBRd8qDa9Uv/AUCgAAAHjFRhYpqjd0lD+xe7NwIUThc6V36kWK3feULAAAAOBVOapIkdz8Uftp0cqNHO+D3/rI7wT55dfa7R7haH75VZECAAAAXpfBIgUAAADAc1CkAAAAALqgSAEAAAB0QZECAAAA6IIiBQAAANAFRQoAAACgC4oUAAAAQBcUKQAAAIAuKFIAAAAAXVCkAAAAALqgSAEAAAB0QZECAAAA6IIiBQAAANAFRQoAAACgC4oUAAAAQBcUKQAAAIAuKFIAAAAAXVCkAAAAALqgSAEAAAB0YVyR4v7T7ffHM08JAAAAcNUUKQAAAIAuDBUp7j+9eXuT5dN98InPmxfv7p+enh6/v9985vP909PT0/3dzZu3N/sCR/JucRSqIQAAAHCdZrqS4vHr7d3Xbx+2pYqnp/vPH74+Vr77+P39oUjx+PV2/8nNx+/2AwEAAACuyHxFiuT6iPp3gyLF47cPn/IvPX7/9M3lFAAAAHBlZrySonL5Q6tIsbtVJIubPgAAAODavHiRonAlBQAAAHCFXqBIcX93uDEk/DcAAABwzcYWKcJf9Li/S37go1mkePx6e/jw9v6OoDBx/zl9mMXjtw9u9wAAAICrM65IEfx66P7XRguvV54oEXzm/bfH3Z+HgTx++xB93bUVAAAAcIXGFikAAAAAzkqRAgAAAOiCIgUAAADQBUUKAAAAoAuKFAAAAEAXFCkAAACALihSAAAAAF1QpAAAAAC6oEgBAAAAdEGRAgAAAOiCIgUAAADQBUUKAAAAoAuKFAAAAEAXFCkAAACALihSAAAAAF1QpAAAAAC6oEgBAAAAdEGRAgAAAOiCIgUAAADQBUUKAAAAoAuKFAAAAEAX/j+0X+ryOUiOpAAAAABJRU5ErkJggg==" alt="" />

原来@RequestPart, @RequestParam注解都有一个可选的boolean参数required, 默认就是true, 瞬间醒悟,把Controller的代码改成这样就解决了错误:

    @RequestMapping(value="/addStudentByForm", method=POST)
public String addStudentByForm(@RequestPart(value="avatar", required=false) byte[] avatar, @Valid Student student, Errors errors) throws Exception {
if (errors.hasErrors()) {
return "addStudentForm";
}

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